Abstract
The use of phosphate salts in boiler water to maintain pH and to prevent corrosion has prompted many studies on the high-temperature/pressure properties of aqueous solutions of these materials. The electrolytic conductivities of aqueous solutions of potassium and sodium phosphates were measured over the temperature range 25--325 C for phosphate concentrations of 0.0005--0.0100 M. The salts investigated were potassium dihydrogen phosphate, potassium monohydrogen phosphate, and potassium phosphate, and the corresponding sodium salts. At all temperatures and concentrations investigated, the conductivities of the potassium salts were higher than those of the sodium salts.
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