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

Friesen, Sergej ; Hefter, Glenn ; Buchner, Richard


Broadband dielec. relaxation spectroscopy (DRS) has been used to investigate aq. solns. of MgCl2 and CaCl2 up to concns. of about 1.8 mol L-​1 at 25 °C over the frequency range 0.07 ≤ ν​/GHz ≤ 89. Detailed anal. of the dominant solvent mode centered at ∼20 GHz showed that both Mg2+ and Ca2+ are strongly solvated, each immobilizing ∼20 water mols. on the DRS timescale. This is consistent with ...


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