Abstract
The author studied the measuring methods of pH, alkalinity in salt, and these methods were proposed. The measurement was made on the pH and alkalinity of various samples such as common salt, refined salt and table salt made by Japanese and foreign salt-manufacturing companies. The results were as follows:
1) The pH and the alkalinity of those samples were in the range of 5.72-10.60, 2.10-7530 as 0.01N H2SO4ml/sample 1,000g respectively.
2) The pH and the alkalinity of common salts were found to have close relations with the scale preventing method in electrodialysis cell, the drying process of common salt and the magnesium content of common salt.
3) As the result of a study made about the influence of sodium chloride concentration on pH decreases of acid and alkaline solutions were studied, the concentration was found to be 0.56-0.86 mol/kg per 0.1pH unit decrease.
