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Cation hydration and ion pairing in aqueous solution of MgCl2 and CaCl2

Friesen, Sergej ; Hefter, Glenn ; Buchner, Richard


Broadband dielectric relaxation spectroscopy (DRS) has been used to investigate aqueous solutions of MgCl2 and CaCl2 up to concentrations of about 1.8 mol L-1 at 25 degrees C over the frequency range 0.07 <= nu/GHz <= 89. Detailed analysis of the dominant solvent mode centered at similar to 20 GHz showed that both Mg2+ and Ca2+ are strongly solvated, each immobilizing similar to 20 water ...


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