Gold is resistant to most acids, though it does dissolve in aqua regia (a mixture of nitric acid and hydrochloric acid), forming a soluble tetrachloroaurate anion. Gold is insoluble in nitric acid alone, which dissolves silver and base metals, a property long used to refine gold and confirm the presence of gold in metallic substances, giving rise to the term 'acid test'. Gold dissolves in alkaline solutions of cyanide, which are used in mining and electroplating. Gold also dissolves in mercury, forming amalgam alloys, and as the gold acts simply as a solute, this is not a chemical reaction.
Gold is resistant to most acids though it does dissolve in aqua regia (a mixture of nitric acid and hydrochloric acid) forming a soluble tetrachloroaurate anion Gold is insoluble in nitric acid alone which dissolves silver and base metals a property long used to refine gold and confirm the presence of gold in metallic substances giving rise to the term 'acid test' Gold dissolves in alkaline solutions of cyanide which are used in mining and electroplating Gold also dissolves in mercury forming amalgam alloys and as the gold acts simply as a solute this is not a chemical reaction