Explain the method of preparation of gold sol by reduction method… - Vidyadip

Question

Explain the method of preparation of gold sol by reduction method.

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Answer

Gold sol is prepared by the reduction of auric chloride using formaldehyde.
$2 AuCl _3+3 HCHO +3 H _2 O \rightarrow 2 Au ($ sol $)+6 HCl +3 HCOOH$

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