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Question
Describe a chemical method for the preparation of sol of platinum in water.
Short Answer
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Solution
Method: A chemical reduction method is used to prepare colloidal platinum.
Procedure: An aqueous solution of platinum chloride (PtCl4) is reduced using a suitable reducing agent like hydrogen gas (H2) or formaldehyde (HCHO). This results in the formation of a colloidal sol of platinum.
\[\ce{PtCl4 + 2H2 -> Pt (Colloidal) + 4HCl}\]
The platinum thus formed remains in the colloidal state in water.
This is an example of a reduction method for preparing metal sols.
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