The pH values for solut ions of borax (sodium tetraborate decahydrate) and sodium chloride were determined from 0 to 60 C by the method of cells without liquid junction. In one series, the effect of sodium chloride on the apparent ionization constant of boric acid was determined by measurements of cells in which the concentration of borax was maintained constant (O.Olm) while that of the sodium chloride was varied. In a second series, the pH values of various concentrations of borax in O.OI-m sodium chloride were measured, and in a third, similar measurements were made of solutions containing O.025-m borax with a variable concentration of chloride.
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Manov et al. (1946) studied this question.
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