An analysis is made of the Kurtze and Tamm acoustic absorption data in MgSO4HCl and MgSO4H2SO4 aqueous mixtures. The reduction in absorption as acid is added to a 0.05 MgSO4 solution cannot be explained on the basis of ion‐pairing alone. However, these apparently different sets of data for each acid‐MgSO4 mixture can be analyzed on a common basis. The results are explained empirically in terms of normal mode kinetic coupling of volume changes between the MgSO4 and HSO4 dissociation reactions as a function of free hydrogen ion concentration.

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