Classification

Compound

Free cyanide

CN, HCN

Simple compounds

a) readily soluble

b) neutral insoluble salts

NaCN, KCN, Ca(CN)2, Hg(CN)2, Zn(CN)2, Cd(CN)2, CuCN, Ni(CN)2, AgCN

Weak complexes

, ,

Moderately strong complexes

, , ,

Strong complexes

, , ,