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Explain what is observed whtn (a) an emulsion is subjected to centrifugation (b) direct current is passed through a colloidal sol (ii) Write a chemical equation showing the preparation of a positive sol. |
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Answer» Solution :(i) (a) Demulsification OCCURS, i.e., the emulsion separates into its constituent liquids. (b) The charged colloidal particles move towards the oppositely charged electrode where they aggregate together and hence get coagulated. (ii) `FeCl_(3)` solution on BOILING undergoes hydrolysis to forms positively charged `FE(OH)_(3)` sol `FeCl_(3)+H_(2)Oto Fe(OH)_(3)HCl` |
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