Question

Preparation of colloids merhod of double decomposition

Answer 1

Explanation:

Hydrophilic or Lyophobic colloidal solutions can be prepared by various chemical techniques such as: Double Decomposition Technique: When hydrogen sulphide is passed through a solution of arsenious oxide in distilled water, we get a colloidal solution of arsenious chloride.

Answer 2

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(i) Double decomposition: An Arsenic sulphide sol is prepared by passing a slow stream of hydrogen sulphide gas through a cold solution of arsenious oxide. This is continued till the yellow colour of the sol attains maximum intensity.

As2O3 + 3 H2S --- --- -- > As2S3(yellow) + 3 H2O

Excess hydrogen sulphide is removed by passing in a stream of hydrogen

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