What is the product formed when Au reacts wit | vedclass

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(D) Aqua regia is a mixture of concentrated $HCl$ and concentrated $HNO_3$ in a $3:1$ ratio.Gold dissolves in aqua regia due to the oxidizing action o

Vedclass · Accepted Answer

$HAuCl_4$

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(D) Aqua regia is a mixture of concentrated $HCl$ and concentrated $HNO_3$ in a $3:1$ ratio.Gold dissolves in aqua regia due to the oxidizing action of $HNO_3$ and the complexing ability of $Cl^-$ ions.The reaction proceeds as follows:$Au(s) + 3NO_3^-(aq) + 6H^+(aq) \rightarrow Au^{3+}(aq) + 3NO_2(g) + 3H_2O(l)$$Au^{3+}(aq) + 4Cl^-(aq) \rightarrow [AuCl_4]^-(aq)$The overall reaction is:$Au(s) + 3HNO_3(aq) + 4HCl(aq) \rightarrow H[AuCl_4](aq) + 3NO_2(g) + 3H_2O(l)$Thus,the final product formed is chloroauric acid,$HAuCl_4$.

What is the product formed when $Au$ reacts with aqua regia?

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