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Osmotic coefficients of polystyrenesulphonates in dioxane-water mixtures—II. Divalent counterions and mixtures of mono- and divalent counterions

✍ Scribed by G. Vesnaver; D. Dolar

Publisher
Elsevier Science
Year
1976
Tongue
English
Weight
283 KB
Volume
12
Category
Article
ISSN
0014-3057

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✦ Synopsis

The osmotic pressures of solutions of magnesium and calcium polystyrenesulphonate in water and in 25 wt % mixture of dioxane in water have been measured for concentrations from 0"002 to 0.06 molal in monomer units. The osmotic coefficient derived from these measurements is almost independent of concentration. Its values for solutions in dioxan~water mixtures are much lower than for aqueous solutions. The osmotic coefficients of solutions containing mixtures of polystyrenesulphonic acid and its calcium salt in 25 wt Yo dioxane have also been determined. The osmotic coefficient of these solutions has a distinct maximum at a certain value of the equivalent fraction of the acid. The experimental results are compared with the predictions of the cylindrical cell model and infinite line charge model. Satisfactory agreement between theory and experiment is found.

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