Question

Explain about coagulation of lyophilic sols and protection of colloids.

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Answer 1

Explanation:

Lyophilic sols are those in which the sol particles are well dissolved and mixed with the solvent. they can be precipitated and formed into a colloidal solution again.

Coagulation of lyophilic sols is the precipitation of colloidal particles out of the solution by the loss of charge on the colloid particles which can be achieved by adding electrolytes, by electrophoresis, or by mixing two oppositely charged sols.

Protection of colloids can be emulated using the example- Lyophobic sols are protected using lyophilic sols which are resistant to easy coagulation and thus keeps the Lyophobic sol (which otherwise gets easily precipitated) from coagulation

Answer 2

Answer:

Lyophilic sols are very stable, there are strong interaction forces between the dispersed phase and dispersion medium. These are strong sols and can be coagulated by the following methods.

1) By the prolonged electrophoresis, the ions are combining and neutralized coagulate.

2) By the addition of electrolyte in large amounts such that oppositely charged ions are added in more proportions which cause neutralizes of oppositely charged ions leading to coagulation.