Abstract
The error of the glass in lithium and sodium aqueous solutions over an extensive pH range was measured at 10 and 50° C. and compared with the data at 25° C. The alkaline error is greater at the higher temperature and less at the lower temperature, but the acid or activity error scarcely changes with the temperature, depending, in agreement with the water electrode theory of Dole, only on the activity of the at any particular pH. The alkaline error increases with the temperature in accord with the requirements of the statistical equation of Dole insofar as the order of magnitude is concerned; the Q quantities, however, instead of being strictly constant, change slightly with the pH, salt concentration and temperature. The data given here have the practical utility of being applicable as a correction factor to glass measurements at temperatures other than 25° C., a pH correction table being included in the paper.
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