Abstract
The calorimetric method for determining the chemical formula and the instability constant of a complex ion involves the determination of the partial molal heat effects resulting from the separate addition of increments of each of the constituents of the complex to a complete range of mixtures of the constituents. The general mathematical derivations necessary for the utilization of the method have been developed, and the complex copper cyanides have been used as an example. The instability constants for the and the ions were found to be and , respectively.

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