What is Caustic Ion Error in pH measurement?

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What is Caustic Ion Error in pH measurement?

A caustic (sodium) ion error occurs when the concentration of hydrogen ions is low (when pH is high). As the pH goes up, the concentration of hydrogen ion goes down, at the same time the concentration of sodium ion will increase. Sodium is very close to hydrogen in its chemical structure. As the concentration of hydrogen ions decrease, the glass will start to recognize sodium as hydrogen, giving a false and therefor lower pH reading.

2017-05-16T17:14:25+00:00 May 16th, 2017|