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Inquire NowTHE CHEMISTRY OF THE EXTRACTION OF GOLD Cu(CN);- and Cu(CN)!-. The insoluble gold cyanide compound AuCN precipitates from acidic solutions of aurocyanide ions as follows: Au(CN); + H+ = AuCN + HCN. (15.2) This reaction takes place readily in strongly acidic solution and slowly in weak acid solutions (pH 2 to 3).
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