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EFFECT OF HEAT ON THE PH OF WATER AND DYE SOLUTIONS.
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
Pagination or Media Count:
The acidity of distilled water is usually attributed to dissolved carbon dioxide, and the carbon dioxide can be removed by boiling whereby the pH of the water returns to 7.0. Recently, the author has observed some interesting phenomena in experiments related to water and dye solutions 1. Freshly distilled water has a pH between 5.0 and 6.0, not 7.0 2. When the temperature is raised from 20C to 100C, the pH will increase by 2.0 units, regardless of whether it is ordinary or specially distilled water. That is to say, if the pH of the water is 5.0 at 20C, it will be 7.0 at 100C and if it is 5.5 at 20C it becomes 7.5 at 100C.
APPROVED FOR PUBLIC RELEASE