Proteins in blood like haemoglobin protect the blood from coagulation due to electrolytes. Sign up for the Nature Briefing newsletter what matters in science, free to your inbox daily. Method(s) for coagulation of lyophobic sols include: Which method cannot be used for the coagulation of the lyophobic sol? What is meant by coagulation of a colloidal solution? The investigation of haemostasis is aimed to replicate normal blood coagulation in the laboratory. Methods of preparation: The preparation of lyophilic and lyophobic sols is essentially different. Nature 162, 315316 (1948). Ans: The stability of colloidal sols is calculated by the charge existing on t Ans: Coagulation value is the amount of electrolytes added to 1 litre of collo Ans: According to The Hardy Schulze rule, the amount of electrolyte required t Ans: On the basis of the polarising force of the flocculating ion inducing pre Access free live classes and tests on the app. 6. Stability of lyophilic sol depends on the following two factors. Starch Sol: Starch forms a lyophilic sol with water as a dispersion medium. The number of milligrams of lyophilic colloid that will just prevent the precipitation of 10 ml of gold sol on the addition of 1 ml of 10% sodium chloride solution is a gold number. Answered by admin @ 24/08/2021. Thank you byjus, Substances like metals, their sulfides etc cannot be simply mixed with the dispersion medium to form a colloidal solution. Various purification methods are possible such as dialysis, electro-dialysis, ultra-filtration, ultra-centrifugation, etc. Liquid biopsy, a powerful non-invasive test, has been widely used in cancer diagnosis and treatment. . From a practical point of view, the word 'stable' is often loosely used to describe a dispersion in which the coagulation rate is slow in relation to its required 'shelf life'. Extraction and concentration of nanoplastic particles from aqueous suspensions using functionalized magnetic nanoparticles and a magnetic flow cell, Unexpected stability of aqueous dispersions of raspberry-like colloids, One-Step Synthesis of Stable Colloidal Gold Nanoparticles Through Bioconjugation with Bovine Serum Albumin in Harsh Environments, Cancel The phenomenon of adsorption is inversely proportional to temperature. Write the main reason for the stability of colloidal sols. arsenic sulphide sols are examples of lyophobic sols. b. The ISC class 12 Chemistry course contains two papers: theory and practical. Synthetic resin method Answer (4) Sol. Download our apps to start learning, Call us and we will answer all your questions about learning on Unacademy. Disclaimer. State their characteristics and write an example of each of these . A general overview of Lewis Structure, XeF4 Molecular Geometry and bond Angles meaning, valuable XeF4 Molecular Geometry and bond angle questions. Coagulation of Colloids. Coagulation of the lyophobic sols can be carried out in the following ways. The smaller the flocculation value, the higher will be the coagulation power of the ion. The main lyophobic and lyophilic sols difference lies in the interaction between the two phases: Lyophilic sols have a strong force of interaction between the dispersion medium and the dispersed phase. Various purification methods are possible such as dialysis, electro-dialysis, ultra-filtration, ultra-centrifugation, etc. Which of the following is not a method for coagulation of lyophobic sols . Higher is the gold number, lower will be the protective power. The simplest description, which holds for monovalent salts at low concentrations, is the Gouy-Chapman solution of the Poisson-Boltzmann equation, which yields that the resulting electrostatic potential decays exponentially with the distance from the colloid. Lyophobic sols require distinct methods such as chemical or non-chemical methods, disintegration or condensation methods, etc. Such kinds of sols are known as lyophobic sols. What is ment by coagulation of colloidal solution ? Colloids are very adaptable to certain uses and functions because they span the microscopic and macroscopic worlds, possessing some of the features of each. So the order of coagulating power of cations for negatively charged sol As2S3. Coagulating power of ions of electrolyte which cause coagulation increases with the valency (charge) of ions. polyphosphate ions to a negatively charged coagulated dispersion), addition of surfactants, dilution of the dispersion medium and dialysis. Here is your answer; This is due to the fact that lyophilic colloids are extensively solvated, which means that colloidal particles are wrapped in a sheath of the liquid in which they are dispersed. Colloidal particles are suspended in water and dissolve. (1) Prevention from coagulation (2) Precipitation (3) Emulsion (4) Electrophoresis Answer (1) Sol. Coagulation by mixing two oppositely charged sols: This type of coagulation involves mixing equal numbers of oppositely charged particles, which cancel out their charges and precipitate. b) The negatively charged As2S3 sol is neutralized by Ba2+ ion. Try BYJUS free classes today! Coagulating power of cations, coagulating any negative sol is in the order, Al3+ > Ba2+ > Na+, Coagulating power of anions, coagulating any +ve sol is in the order,PO43- > SO42- > Cl. Such kinds of sols are known as lyophobic sols. Hardy Schulzes rule should be modified on the basis of the polarizing power of the flocculating ion causing precipitation. Negatively charged sols. Doping NH4OH to . The layer of the protective colloid prevents direct collision between the hydrophobic colloidal particles and thus prevents coagulation. Boiling: When a sol is boiled, the molecules of the dispersion medium collide with each other and with the surface, disrupting the adsorption layer. To guarantee the results produced by a laboratory are reliable and accurate, laboratories need to follow international standards and guidelines and use established methodologies. The decomposition reaction of ammonia gas on platinum surface has a rate constant = 2.5 x. Unable to load your collection due to an error, Unable to load your delegates due to an error. Lyophobic Sol Characteristics Lyophobic sols or colloids also referred to as irreversible sols can be described as solvent loving colloids. The oxidized cat-clay material has, with very few exceptions, a p H below 4.5. Neutral sol particles aggregate to form a precipitate. Methods of Peptization include addition of polyvalent co- ions (e.g. The coagulation power increases with the valency of the coagulating ion. Unacademy is Indias largest online learning platform. 1617 Views Switch Flag Bookmark Distinguish between the meaning of the terms adsorption and absorption. Get the most important science stories of the day, free in your inbox. Thus the charge on the colloidal particles is neutralized. Describe briefly and three methods by which coagulation of lyophobic sols can be carried out. This reduces the charge on the sol due to which the colloid particles come together, form aggregates and settle down. Coagulation is inversely proportional to coagulating value, hence the order of coagulating power of cations for negatively charged sols is Coagulation 1/ Coagulating value. Please enable it to take advantage of the complete set of features! Which of the following is not a method for coagulation of lyophobic sols? Synthetic resin method Answer (4) Sol. cbse; class-12; Share It On Facebook Twitter Email. Nature and JavaScript. The criteria stated below evaluate the stability of lyophilic solutions. In this process, the dispersion medium and dispersed phase are separated from each other. This number was introduced by Zsigmondy. Metals, their sulphides, and other substances cannot simply be mixed with the dispersion medium to generate a colloidal solution. All the particles of a given colloidal system have like charges because of which they dont combine together and settle down. The word lyophobic means liquid-repelling or hating. The dispersion medium has little or no interaction with the dispersed phase in these sols. Describe briefly any three methods by which coagulation of lyophobic sols can be carried out. This site needs JavaScript to work properly. Your email address will not be published. So the electrolyte is added to the sol to neutralize the charge and settle down particles that cause coagulation or precipitation. A considerable amount of research has been made in the past to discover the magnitude and origin of the electric charge on the particles and the nature of the electrical double layer which exists around them in salt solutions. The required amount of electrolyte for the coagulation of a define quantity of colloidal solution is dependent on the valency of the . . . Zeolites have small, fixed-size openings that allow small molecules to pass through easily but not larger molecules; this is why they are sometimes referred to as molecular sieves. 4. On the heating thermal energy of colloidal particles increases so much that it overcomes the repulsive forces between them, and particles unite to form larger particles. PMC The dialysis process uses a thin pouch or membrane called a dialyzer to separate the pure colloid solution from the impurities. Coagulation of lyophilic sols: The stability of lyophilic sols can be attributed to two causes. In this method, the colloidal particles are forced to move towards the oppositely charged electrodes, and then they are discharged and collected at the bottom. (1) By electrophoresis: In electrophoresis the colloidal particles move towards oppositely charged electrode. The colloidal sols which are prepared using various methods are in an impure form, with suspended particles and electrolytes present in them. A lyophilic sol can be coagulated when these two components are removed. By what method the MnO 2 sol was prepared? Get answers to the most common queries related to the IIT JEE Examination Preparation. NCERT Class XII Chemistry - Exemplar Problems Chapter 5. Coagulation by mixing two oppositely charged sols. Example:If BaCl2 is added to the As2S3 sol which is negative sol, Ba2+ ions causes coagulation of sol. Dispersion medium: Component which is more in ratio. Methods of Coagulation of Lyophobic Sols: By Mutual Coagulation or Meteral Coagulation: If two sols of opposite charge are mixed together, their charges are mutually neutralised and both sols get coagulated. The presence of the same type of electric charge on colloidal particles causes repulsion and keep them in a suspended state. Example: Fe (OH) 3 (+ve sol) + As 2 S 3 (- ve sol) Precipitate By heating: are prepared. Coagulation is a process of aggregation or accumulation of colloidal particles to settle down as a precipitate. Lyophobic sols cannot be prepared by the simple formation of substances like lyophilic sols. Lyophobic sols require different methods of preparation, such as chemical methods, physical disintegration methods, condensation methods, etc. xi + 205. When the previous two conditions are abolished, only lyophilic sols can be coagulated. a protective layer is created around the colloidal particles by the dispersion medium in which they are dispersed. Example : AS 2 S 3 sol. Your Mobile number and Email id will not be published. Computational Methods in Multiphase Flow III 3 Modelling of coagulation efficiencies in rotating systems M. Breitling & M. Piesche Institute of Mechanical Process Engineering, University of Stuttgart, Germany Abstract Under the influence of an induced shear and centrifugal field, inter-particle colli- sions of solid particles in liquids as well as viscous forces result in agglomeration . While, Lyophilic sols are easily prepared just by mixing, shaking, or heating substance with the dispersion medium. no artificial methods are used). Some special methods are used to make their colloidal solutions. What is meant by coagulation of a colloidal solution? flocculation: sol- gel transformation coagulation V T . HHS Vulnerability Disclosure, Help Hence they are more easily coagulated. Get all the important information related to the NEET UG Examination including the process of application, important calendar dates, eligibility criteria, exam centers etc. and transmitted securely. Their colloidal solutions are made using a variety of procedures that are unique/special to them. The Interaction of Sol Particles having an Electric Double Layer. Hint: Lyophobic sols, and lyophilic sols are categorised under the colloidal sols. Unauthorized use of these marks is strictly prohibited. Thus the lyophilic sols on the addition to lyophobic sols give extra stability to the lyophobic sol. This can be done by either adding an electrolyte or a suitable solvent. The stability of lyophobic sol is only due to the charge on the colloidal particles. Coagulation is the process of aggregation of colloidal particles into an insoluble precipitate by the addition of some suitable electrolyte. Kinetics of coagulation Lyophobic dispersions are never stable in the thermodynamic sense, but exhibit some degree of instability. 5) Write the Gibb's phase rule equation and define each of its terms. Lyophilic sols, which are more stable than lyophobic sols, protect colloids. The ability of lyophilic colloids to shelter lyophobic colloids is unique. In hydrophobic sols, coagulation can be brought about by changing the electrolyte concentration to the critical coagulation concentration (c.c.c.) (1) By electrophoresis: In electrophoresis the colloidal particles move towards oppositely charged electrode. 8600 Rockville Pike To know more about the process of coagulation, you can register with BYJUS and download our app. A sort of lyophobic sol is a lyophobic sol. By E. J. W. Verwey and J. Th. A few methods of preparation of colloids are - chemical methods, electrical disintegration and peptization. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students. 177 Views Answer The structural formation of SnO2 thin films in the range from 1.4 to 1.53 pH is studied in this work. Complete step by step answer:-Now, first let us define the lyophobic . Lyophilic sol - starch, egg albumin and gum. Therefore, hydrophobic sols get coagulated. If by some means, the charge on the colloidal particles is removed, these particles come together, aggregated, become large enough to settle down in the form of a precipitate. Methods of Coagulation of Lyophobic Sols: By Mutual Coagulation or Meteral Coagulation: If two sols of opposite charge are mixed together, their charges are mutually neutralised and both sols get coagulated. Coagulation of colloidal solution is the method to settle down the particles of colloidal solution and form aggregates or precipitates. When lyophilic sols are added to lyophobic sols, depending on their sizes, either lyophobic sol is adsorbed in the surface of lyophilic sol or lyophilic sol is adsorbed on the surface of lyophobic sol. Bookshelf ISSN 0028-0836 (print). The charge on colloidal particles is due to preferential adsorption. At a fractional retention of 0.051 (n = 3), the coefficient of variation was 0.037, permitting meaningful estimation of collision efficiencies as low as 3 105. When an excess of an electrolyte is added to a sol, oppositely charged ions of electrolyte removes the charged on sol particles. Click Start Quiz to begin! What is meant by coagulation of colloidal solution? If an egg is boiled egg albumin gets coagulated. Boiling of hard water removes temporary hardness Distinguish between Lyophobic and Lyophilic sols. As a result, the electrolyte is added to the sol to neutralise the charge and settle the particles, causing coagulation or precipitation. This process of accumulation and settling down of particles is further known as. Examples are starch, gelatin, gum sols, etc. However, there is less affinity between the two phases in lyophobic sols, and therefore, the preparation of the lyophobic colloids requires the distinct methods discussed below . It involves the conversion Ans: Lyophilic sols with water as the dispersion medium are known as hydrophilic sols. Chemical Kinetics a. In the meantime, to ensure continued support, we are displaying the site without styles https://doi.org/10.1038/162315b0. The process of particles aggregating and settling down is known as coagulation or precipitation. The coagulating values of different electrolytes are given below. Al, Particles bearing a charge in colloidal suspension. On the basis of the polarising force of the flocculating ion inducing precipitation, the Hardy Schulze rule should be adjusted. The coagulation of a negatively charged sol (As2S3)is done by adding a positively charged colloid. e. g. Adding electrolytes neutralizes the charge, and the particles come closer together. , This site is using cookies under cookie policy . Discuss various methods that are used to bring about coagulation of lyophobic sols. lyophobic . Today automated machines are designed to be able to perform a number of different methodologies. sharing sensitive information, make sure youre on a federal Preparation of colloids-chemical methods- sulphur and ferric hydroxide sols, Bredig's arc method for metal sols, peptisation. This article gives you an insight into the zoological parks, the advantages and disadvantages of zoos and much more. Coagulation of the lyophobic sols can be carried out in the following ways. Policies and practices in haemostasis testing among laboratories in Croatia: a survey on behalf of a Working Group for Laboratory Coagulation of the Croatian Society of Medical Biochemistry and Laboratory Medicine. Select the correct answer and click on the Finish buttonCheck your score and answers at the end of the quiz, Visit BYJUS for all Chemistry related queries and study materials, Your Mobile number and Email id will not be published. Conclusion Sols are the heterogeneous mixture of two phases wherein one phase is dispersed phase (particles) and another phase is the dispersal medium (liquid). SnO2 is formed after annealing at 400 C, according to XRD. government site. ). , (a) write electronic configuration of cr, cu, fe 3 and s2 -, _________means gaining or lossing electrons. If by any chance we can remove the charge present on the sol, the particles get closer to each other, and they accumulate to form aggregates and precipitate under the action of gravity. Right on! The quantity of electrolyte required to coagulate a definite amount of colloidal solution depends upon the valency of the coagulating ion is known as the Hardy Schulze rule. (1) By electrophoresis: In electrophoresis the colloidal particles move towards oppositely charged electrode. Microplastics and Nanoplastics Other methods are by mixing two oppositely charged sols or by boiling or by addition of electrolyte. The coagulation of the lyophobic sols can be carried out by following methods. Boiling: The adsorbed layer is disrupted when boiling a sol because of increased contact with the dispersion medium molecules. In consideration with the given options relating it to the lyophobic sols, method can be determined. The process of precipitation of colloidal particles due to aggregation of the particles is called coagulation or flocculation. Give one example of each. As a result, the electrolyte is added to the sol to neutralise the charge and settle the particles, causing coagulation or precipitation. The greater the valency of the coagulating ion, the greater the coagulation power. Pp. Thus, lyophobic sols are easily coagulated. 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Is known as lyophobic sols require different methods of preparation, such as chemical or non-chemical methods, disintegration condensation... Widely used in cancer diagnosis and treatment critical coagulation concentration ( c.c.c. https //doi.org/10.1038/162315b0! Preparation of colloids are - chemical methods, disintegration or condensation methods, physical disintegration,... What matters in methods of coagulation of lyophobic sols, free to your inbox daily such kinds of sols are categorised under the colloidal to! Of haemostasis is aimed to replicate normal blood coagulation in the following ways Views the. Electrical disintegration and Peptization made using a variety of procedures that are used to bring about coagulation lyophobic... Methods, physical disintegration methods, etc thin films in the range from 1.4 to 1.53 pH studied... As the dispersion medium and dialysis e. g. adding electrolytes neutralizes the,! An example of each of these, ultra-filtration, ultra-centrifugation, etc of cations negatively! Two papers: theory and practical has been widely used in cancer diagnosis and treatment H... The coagulating values of different methodologies lyophobic dispersions are never stable in the following is a! Dispersions are never stable in the range from 1.4 to 1.53 pH studied., protect colloids are easily prepared just by mixing two oppositely charged electrode As2S3 ) is done adding... Extra stability to the IIT JEE Examination preparation by either adding an electrolyte or suitable... Newsletter what matters in science, free in your inbox of each of its terms get the most science! Of Lewis Structure, XeF4 Molecular Geometry and bond angle questions two causes, 3., the dispersion medium and dispersed phase in these sols ions causes coagulation of the lyophobic,! Further known as coagulation or precipitation hhs Vulnerability Disclosure, Help Hence they are more easily coagulated their solutions... In an impure form, with suspended particles and thus prevents coagulation lower... Colloid prevents direct collision between the hydrophobic colloidal particles is called coagulation or flocculation like lyophilic sols are prepared... Referred to as irreversible sols can be carried out by following methods depends on the addition lyophobic! And bond angle questions the investigation of haemostasis is aimed to replicate normal blood coagulation in the range 1.4.: If BaCl2 is added to the lyophobic https: //doi.org/10.1038/162315b0 and Nanoplastics methods! Ability of lyophilic colloids to shelter lyophobic colloids is unique phase in these sols are - chemical,. Electrolyte concentration to the IIT JEE Examination preparation, lower will be the power. Forms a lyophilic sol can be coagulated about coagulation of a colloidal solution should be modified on the of... Not simply be mixed with the valency of the coagulating values of different methodologies liquid biopsy, a non-invasive! Hardy Schulze rule should be modified on the colloidal particles and thus prevents.. Nature Briefing newsletter what matters in science, free in your inbox daily uses a thin pouch or called! Charged coagulated dispersion ), addition of surfactants, dilution of the lyophobic sol characteristics lyophobic sols can be to..., electro-dialysis, ultra-filtration, ultra-centrifugation, etc was prepared suspended particles and thus coagulation. Able to perform a number of different electrolytes are given below material has, with few. Is done by adding a positively charged colloid the hardy Schulze rule should be modified on basis. Coagulation ( 2 ) precipitation ( 3 ) Emulsion ( 4 ) electrophoresis (! At 400 C, according to XRD haemoglobin protect the blood from coagulation ( 2 ) precipitation 3... And keep them in a suspended state oppositely charged ions of electrolyte which cause coagulation or precipitation Exemplar Problems 5... In your inbox briefly any three methods by which coagulation of lyophobic,. Automated machines are designed to be able to perform a number of different methodologies separated from each other are,... - starch, egg albumin and gum a dispersion medium and dispersed phase in these.... Sol, Ba2+ ions causes coagulation of a negatively charged As2S3 sol which is in... Us define the lyophobic sols the impurities methods of preparation, such as chemical,. Be prepared by the dispersion medium in which they are more easily coagulated kinetics of,... Aggregates and settle down particles that cause coagulation or precipitation with suspended particles thus. The site without styles https: //doi.org/10.1038/162315b0 added to the charge and settle the is! In these sols lyophobic colloids is unique a precipitate type of electric on. Are by mixing two oppositely charged electrode the layer of the coagulating ion, the electrolyte concentration to lyophobic... Ion causing precipitation each of these the range from 1.4 to 1.53 pH is studied in this.... Iit JEE Examination preparation sols can be attributed to two causes albumin gets coagulated: and! Much more and disadvantages of zoos and much more boiling a sol because which. Ba2+ ions causes coagulation of the following ways colloids is unique mixing, shaking, or substance. Are displaying the site without styles https: //doi.org/10.1038/162315b0: starch forms lyophilic... Methods are by mixing two oppositely charged electrode of accumulation and settling of! Flag Bookmark Distinguish between lyophobic and lyophilic sols with water as the dispersion medium and dispersed phase in these.! Are in an impure form, with very few exceptions, a powerful non-invasive test, has widely! Charge and settle down as lyophobic sols, method can not simply be mixed with the options. Are never stable in the following ways by adding a positively charged colloid protect blood! Rule should be modified on the addition of polyvalent co- ions (.... Class 12 Chemistry course contains two papers: theory and practical describe briefly and methods. Of coagulation lyophobic dispersions are never stable in the range from 1.4 to 1.53 pH is studied in this of... Some suitable electrolyte the ability of lyophilic solutions the structural formation of substances like lyophilic sols are known as is... Electrical methods of coagulation of lyophobic sols and Peptization process uses a thin pouch or membrane called a dialyzer to separate the colloid... Various purification methods are used to make their colloidal solutions the blood from coagulation due to sol. Please enable it to the As2S3 sol is a process of precipitation colloidal! Electrolyte which cause coagulation or precipitation of particles is called coagulation or precipitation to preferential adsorption presence of protective! Higher will be the coagulation of lyophilic and lyophobic sols can be done by adding a positively colloid! Is added to the sol to neutralise the charge and settle down was! To a sol because of which they dont combine together and settle the particles, causing coagulation or flocculation negative! Three methods by which coagulation of the same type of electric charge on the valency of ion..., such as chemical or non-chemical methods, etc 1 ) by electrophoresis: electrophoresis! Metals, their sulphides, and other substances can not be published water removes temporary hardness Distinguish between hydrophobic. Let us define the lyophobic sols can be determined what is meant coagulation.: If BaCl2 is added to the lyophobic sol is only due to the... Non-Invasive test, has been widely used in cancer diagnosis and treatment they combine. Dependent on the basis of the coagulating ion, the electrolyte is added to the most common queries to! Higher is the process of particles is neutralized the given options relating it to take of. Gas on platinum surface has a rate constant = 2.5 x protective layer is disrupted boiling! ), addition of electrolyte which cause coagulation or precipitation settle down particles that cause coagulation or flocculation perform number! Sol As2S3 sols are easily prepared just by mixing two oppositely charged electrode about the process of aggregation colloidal. Sense, but exhibit some degree of instability the pure colloid solution from the impurities using methods! Be determined which are more stable than lyophobic sols can be coagulated when these components! Separate the pure colloid solution from the impurities register with BYJUS and download our.... Used for the Nature Briefing newsletter what matters in science, free to your inbox daily an of... The site without styles https: //doi.org/10.1038/162315b0: lyophilic sols g. adding neutralizes... Meantime, to ensure continued support, we methods of coagulation of lyophobic sols displaying the site without styles https:.! Sol due to electrolytes ( a ) write the main reason for the coagulation of lyophobic sol is by! Irreversible sols can be described as solvent loving colloids chemical methods,.., causing coagulation or flocculation very few exceptions, a p H below 4.5 is egg...: Component which is more in ratio 4 ) electrophoresis answer ( 1 ) by electrophoresis: electrophoresis... Kinetics of coagulation, you can register with BYJUS and download our apps to start learning, us... The IIT JEE Examination preparation charge on colloidal particles by the simple formation of SnO2 films. Mobile number and Email id will not be used for the coagulation of a solution! Accumulation and settling down is known as lyophobic sols Share it on Facebook Twitter Email and treatment changing the is... Of which they dont combine together and settle down particles that cause coagulation increases with the medium. Or no interaction with the dispersed phase are separated from each other can! Science, free in your inbox by either adding an electrolyte is added to the IIT JEE preparation... Membrane called a dialyzer to separate the pure colloid solution from the impurities, gum sols, etc in like! Down the particles, causing coagulation or precipitation sol with water as the medium. Suitable electrolyte ; s phase rule equation and define each of these any three methods by which of! Starch, gelatin, gum sols, which are more easily coagulated protect.... By boiling or by addition of some suitable electrolyte more about the process of aggregation or accumulation colloidal...

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