Abstract
The Raman spectra of SO 4 2− , WO 4 2−, and MoO 4 2−, have been studied in aqueous solution with great, precision, and the effect of the alkali metal cations has been carefully recorded as a function of concentration. When Li + or Na + were present in solution, the anion vibrational frequency was observed to increase, with Li having the more pronounced effect. The cations K + , Rb + and Cs + caused the frequency to decrease, with Cs + causing the largest decrease, followed by Rb + and then K +. Precise values of the symmetric stretching mode frequencies at infinite dilution were obtained by extrapolation. The frequency shifts with respect to these values, were found Co depend on the square root of the concentration.
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