November 2001

Letters to the Editor

Letters to the editor

pH Measurement I have found an error in the article "Proper pH measurement," (August, p. 120). In the section referring to pH measurement in high purity water, the author talks about adding a "neutral..

pH Measurement I have found an error in the article "Proper pH measurement," (August, p. 120). In the section referring to pH measurement in high purity water, the author talks about adding a "neutral salt" such as potassium hydroxide (KOH) to the sample to improve conductivity. I believe what she intended was addition of a neutral salt, like potassium CHLORIDE, would increase ionic strength of the solution, and thereby yield a stable pH reading. KOH is a strong base and its addition to a pure water sample would greatly affect the pH. Because of the low buffering capacity in pure waters, just a few drops of KOH would easily push the solution to the upper end of the pH scale. Also, Thermo

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