Heat capacities of solutions. Coupled chemical equilibria

Abstract

The isobaric equilibrium heat capacity of a solution is related to the composition and thermodynamic parameters characterising two coupled chemical equilibria between solutes in solution. The resulting equation is compared with the corresponding equations for the isobaric equilibrium heat capacities of a solution in which a single chemical equilibrium between solutes is present. The presence of coupling between equilibria means that the isobaric equilibrium heat capacity of the solution is not simply the sum of two contributions linked with each equilibrium. The procedures described form the basis of treatments for more complicated systems.