In the reaction M + 8CN⁻ + 2H2O + O2 - 4[M(CN)2]⁻ + 4OH⁻, identify the metal M.

Question

In the reaction M + 8CN⁻ + 2H2O + O2 -> 4[M(CN)2]⁻ + 4OH⁻, identify the metal M.

Accepted Answer

Ag. This is the cyanide extraction of silver, where Ag dissolves in dilute NaCN/KCN in presence of air to form the soluble [Ag(CN)2]⁻ complex.

In the reaction M + 8CN⁻ + 2H2O + O2 -> 4[M(CN)2]⁻ + 4OH⁻, identify the metal M.