THE INFLUENCE OF SODIUM CHLORIDE ON THE COLORIMETRIC DETERMINATION OF pH

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Abstract
The salt error of the sulphonphthalein series of indicators has been measured at 1, 2, and 3 M salt concentrations. By subtracting 0.3 unit from the observed colorimetric Ph, results may be obtained for solutions containing 6-18% salt which are in conformity with the electrometric data.