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प्रश्न
Describe a chemical method for the preparation of sol of sulphur in water.
How is the following sol (in water) prepared?
Sulphur
लघु उत्तरीय
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उत्तर
Method: A chemical method of oxidation is used for preparing sulphur sol.
Procedure: Hydrogen sulphide gas (H2S) is passed through a solution of sulphur dioxide (SO2) in water.
A red colloidal sol of sulphur is formed by the following reaction:
\[\ce{2H2S + SO2 -> 3S (Colloidal) + 2H2O}\]
The sulphur precipitated in this reaction remains in the colloidal state and forms a milky sol.
This is an example of oxidation of a gas to form a colloid.
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