The experimental study of the rate of dissociation of salt hydrates. The reaction CuSO 4 .5H 2 O = CuSO 4 .H 2 O + 4H 2 O

Abstract
The work described here forms part of a study of the relationship between absolute reaction velocity and its temperature coefficient in systems of the type Solid 1 → Solid 2 + Gaseous Product, and of the influence of the gaseous product upon the velocity. Preliminary Experimental Considerations . Rate measurements in heterogeneous systems of this kind are subject to certain difficulties which necessitate an extensive examination of the special circumstances of the reaction before much significance can be attributed to the absolute magnitude of an observed rate. It will be convenient to discuss these difficulties in terms of a dissociating salt hydrate, S1 . n H 2 O → S 2 . n 2 H 2 O + ( n 1 ─ n 2 )H 2 O, in which it is supposed that no solid solution is formed. It is assumed that the course of the reaction is being followed by direct measurement on a spring-balance of the weight change of the solid due to loss of the gaseous product.

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