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Gold S Affinity To Cyanide

A major use of cyanide salts is in gold mining.Crushed ore is sprayed with an aqueous solution of sodium cyanide, nacn.The cyanide ion has a very high affinity for gold atoms and reacts to form the stable and soluble aucn2- anion 4 aus 8 cn-aq o2g 2 h2ol right arrow 4 aucn2-aq 4 oh-aq.