Heats of solution of 1:1 electrolytes in 1,2- and 1,1-dichloroethane and derived enthalpies and entropies of transfer of electrolytes from water to these solvents |
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| Authors: | Michael H Abraham Angela F Danil de Namor Ronald A Schulz |
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| Institution: | (1) Department of Chemistry, University of Surrey, Guildford, Surrey, England |
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| Abstract: | Heats of solution of nine electrolytes in 1,2-dichloroethane and of three electrolytes in 1,1-dichloroethane have been determined calorimetrically at various electrolyte concentrations and extrapolated to zero concentration to yield  H
s
o
values for these electrolytes. It is shown that values of H
t
o
for transfer from water to the dichloroethanes of 1 1 electrolytes are often negative, so that these electrolytes can be more stable enthalpically in the less polar solvents. Combinations of the H
t
o
values with previously determined G
t
o
values yield values of S
t
o
for transfer of 11 electrolytes from water to the dichloroethanes. These S
t
o
values are mostly very negative; they can be correlated very well by the method of Abraham, and in this way S
t
o
values for transfer of numerous other anions and cations have been predicted. The Ph4As+/Ph4B– convention yields single-ion entropies of transfer from water to the dichloroethanes in reasonable agreement with values calculated by the correspondence-plot method. |
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| Keywords: | Electrolytes anions cations heats enthalpies entropies solution transfer 1 1-dichloroethane 1 2-dichloroethane |
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