Abstract
The low temperature phase diagrams have been determined for the potassium benzoate – water and the sodium benzoate – water systems. The ice eutectics with these anhydrous alkali benzoates were found at −11.8 °C with 34.89% potassium benzoate and at −14.5 °C with 39.7% sodium benzoate. Previously reported hydrates of potassium benzoate (3) were not observed. Concentrated sodium benzoate solutions below 0 °C were found to attain equilibrium with sodium benzoate only with the greatest difficulty.
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