Abstract
Addition of sodium and potassium chlorides significantly affected the changes in pH in solutions of phosphates during freezing. Changes in pH in solutions of phosphates with chlorides depended on the relative contents of sodium and potassium in much the same way as in solutions of phosphates alone. Addition of sodium chloride usually caused additional decreases in pH and had a large effect on the pH of the eutectic solution. Addition of potassium chloride did not markedly affect the pH of the eutectic solution although it usually caused an increase in pH during the initial phase of freezing. Several eutectic points of solutions containing chlorides in addition to sodium and potassium phosphates were determined, and a relatively complete picture of the phase relations during precipitation of ice and one or more salts was obtained. The pH of all solutions containing sodium chloride in addition to phosphates was less than 4, while the pH of eutectic solutions containing potassium chloride but not sodium chloride was above 6.
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