Abstract
Internal pressures, (∂U/∂V)T, have been
obtained at 25�C for solutions of 25 solutes in water by measurement of the
thermal pressure coefficients. Values at 1.00 M solute concentration were
plotted against the molar volume of the solutes. Those solutes (electrolytes)
which appear above a line joining five solutes acting as 'non-interacting' homomorphs were judged to be structure breakers in water;
those solutes (lithium salts, tetraalkylammonium
salts, non-electrolytes) appearing below the line were termed structure makers.
These observations are in agreement with current knowledge, and they
substantiate the present interpretation of the physical significance of
internal pressures.
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30 articles.
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