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Sols are colloidal systems in which dispersion medium is liquid and dispersed phase is solid.

a) Write any four differences between lyophilic sols and lyophobic sols.

b) Peptisation is a method .of preparation of sols. Write a general procedure for peptisation.

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a)

Lyophilic sols Lyophobic sols
1. Liquid - loving 1. Liquid - hating
2. Revesible 2. Irreversible
3. Stable 3. Not stable
4. Cannot be easily coagulated and no stabilising agent re - quired 4. Can be easily co - agulated and need a stabilising agent for preservation

b) Peptization is the process of converting a precipitate into colloidal sol by shaking it with a dispersion medium in the presence of small amount of electrolyte. The electrolyte used for this purpose is called peptizing agent. This method is applied to convert a freshly prepared precipitate into a colloidal sol. During peptization, the precipitate adsorbs one of the ions of the electrolyte on its surface. This causes the development of positive or negative charges on precipitates, which ultimately break up into smaller particles of the size of a colloid.

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