Abstract
The linearized hydrodynamic description of concentration fluctuations in ionic solutions can be used to predict the Rayleigh and Brillouin light scattering. Using new experimental results for solutions of potassium fluoride and potassium bromide, we critically examine and test the hydrodynamic description for a wide range of concentrations. Approximations which are used to calculate the piezooptic coefficient are shown to be inaccurate for all but low concentrations (less than 1 m). The previous practice of ignoring terms containing (∂n/∂T) is found to be wrong, and these terms are shown to be important for these solutions. The information required to obtain mean activity coefficient data from light-scattering results is also outlined.
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