Dichlorcyanoplatinic Acid, H₂Pt(CN)₄Cl₂

Dichlorcyanoplatinic Acid, H₂Pt(CN)₄Cl₂, has been obtained by decomposing the barium salt with dilute sulphuric acid and concentrating the filtered solution. It yields deliquescent crystals, which dissolve in water to an acid solution which decomposes carbonates.

The corresponding bromine derivative, H₂Pt(CN)₄Br₂, has been obtained, and several salts of these acids and of the iodo acid have also been prepared.