Abstract
The apparent molal volume and adiabatic compressibilities of some transition metal (Mn2+, Co2+ Ni2+, Cu2+, Zn2+, and Cd2+) sulfates have been determined at 25°C. Values of\(\Delta \bar V^\circ = 3.4\) to 11.4 cm3-mole−1 and\(\Delta \bar K^\circ = 17.8\) to 31.3 × 10−4cm3-mole–1-bar–1 at 1 atm were found for the formation of the transition metal sulfate ion pairs. These results are in good agreement with the values obtained from the high-pressure conductance measurements of Fisher et al., Shimizu et al., and Taniguchi et al. The volume and compressibility data indicate that 3.1±0.7 water molecules are lost when transition metals form ion pairs with SO 2−4 . The fractions of inner-sphere ion pairs (20%) estimated in this study are in good agreement with the values obtained from ultrasonic measurements.
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Lo Surdo, A., Millero, F.J. The volume and compressibility change for the formation of transition metal sulfate ion pairs at 25°C. J Solution Chem 9, 163–181 (1980). https://doi.org/10.1007/BF00648324
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DOI: https://doi.org/10.1007/BF00648324