The volume and compressibility change for the formation of transition metal sulfate ion pairs at 25°C |
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Authors: | Antonio Lo Surdo Frank J Millero |
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Institution: | (1) Rosenstiel School of Marine and Atmospheric Science, University of Miami, 33149 Miami, Florida |
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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
to 11.4 cm3-mole–1 and
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
4
2–
. 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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Keywords: | Molal volumes molal compressibilities transition metal sulfates ion pair formation |
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