Gold is extracted by the formation of a solub | vedclass

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(B) The extraction of gold from its native ore involves leaching with a dilute solution of sodium cyanide $(NaCN)$ or potassium cyanide $(KCN)$ in the

Vedclass · Accepted Answer

$[Au(CN)_2]^-$

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(B) The extraction of gold from its native ore involves leaching with a dilute solution of sodium cyanide $(NaCN)$ or potassium cyanide $(KCN)$ in the presence of air (which provides $O_2$).The chemical reaction is:$4Au(s) + 8CN^-(aq) + 2H_2O(aq) + O_2(g) \rightarrow 4[Au(CN)_2]^-(aq) + 4OH^-(aq)$Thus,the soluble complex formed is $[Au(CN)_2]^-$,which is dicyanoaurate$(I)$ ion.

Gold is extracted by the formation of a soluble cyanide complex. What is the formula of this cyanide complex?

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