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Handbook of Solvents - George Wypych - ChemTech - Ventech!

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526 Y. Y. Fialkov, V. L. Chumak<br />

Figure 9.7. E T and Z parameters for some mixed solvents.<br />

9.3.3.2 Solvating ability<br />

Applying the widely-used chemical thermodynamics concept <strong>of</strong> free energy linearity, it is<br />

easy to demonstrate that any characteristic y which linearly depends on free energy or on<br />

free activation energy <strong>of</strong> process in the mixed solvent composed <strong>of</strong> specifically non-interacting<br />

components, shall be linear function <strong>of</strong> the components with partial molar concentration<br />

x.<br />

i<br />

=∑<br />

1<br />

y y x<br />

i i<br />

[9.44]<br />

The formula was developed analytically by Palm. 16 In the mixed solvents with chemically<br />

interacting components, the function y=f(x) can substantially deflect from the linear<br />

form including appearance <strong>of</strong> extrema.<br />

Selection <strong>of</strong> the mixed solvent components allows us in most cases to provide controlled<br />

solvation <strong>of</strong> all substances, participating in the chemical process performed in solu-

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