The Potentiometric Titration of Filtrates from the Bachmann Process
PENNSYLVANIA STATE UNIV STATE COLLEGE
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The details of the study which led to the use of the glass electrode for adjusting the acidity of Bachmann filtrates previous to distillation are presented. Titration data for various synthetic mixtures are given. These data indicated that by adjusting the pH of the solutions to about 2.0 with concentrated ammonium hydroxide, the nitric acid should be converted to ammonium nitrate and thus be retained in the distillation residue. In practice, several Bachmann filtrates were adjusted to various hydrogen ion concentrations and then distilled. In most cases where the pH was 2.0 or above, the ferrous sulfate test was negative and the phenoldisulfonic acid test indicated less than 100 ppm, of nitrate ion in the distillates from these solutions.
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