Abstract
A polarographic study of the complexation reactions between mercuric cyanide and alkali halides has been carried out. In basic solutions, the existence of two species Hg (CN)2 X− and Hg (CN)3 X−= being reduced has been concluded (where X=Cl, Br or CNS). The cyanide released by the reduction combines with Hg (CN)2 X− at or around the surface of the drop to form Hg (CN)3 X−=. The logarithms of the overall formation constants of these species at an ionic strength of 2·0 are: 36·19 and 39·43 for chloride, 35·99 and 39·10 for bromide and 36·30 and 38·74 for thiocyanate complexes.
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