Raman spectra for the Cd2+–OH2 stretching vibration (ν1 band) were measured for aqueous Cd(NO3)2 solutions of R=15 and 40 (R: moles of water/moles of salt). Contrary to the results reported by Kuznetsov et al., it is concluded that the hydration number of Cd2+ ions does not change with salt concentration in the Cd(NO3)2 solution.
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Hitoshi Kanno (1986) studied this question.
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