Question

Method by which lyophobic colloids can be coagulated

Answer 1

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Here is your answer.

The coagulation of a lyophobic colloidal solution can be achieved  by mixing two oppositely charged sols.

EX: If equal proportions of a positively charged sol of hydrated ferric oxide and a negatively charged sol of arsenious sulphide are mixed, then the coagulation of both the sols takes place. This type of coagulation is called mutual coagulation.

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Answer 2

Answer:  By addition of electrolytes

Explanation:

Coagulation is a phenomenon of the aggregation of colloidal particles so as to make them settle under the effect of gravity.

Coagulation of lyophobic colloids is brought about by addition of electrolytes.

When a electrolyte is added to a a colloidal solution, the particles off the sol take up the ions which are oppositely charged and thus get neutralized.

The neutral particles start accumulating to form bigger particles and thus settle down.