Why we should calibrate pH meter with buffer solutions (4.0, 7.0 and 9.2). Is there any specific reason other than checking pH meter working ?

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J. C. Tarafdar

@ Eetela, buffer solution is needed for calibration of pH meter as they resist the changes in pH if you accidentally add a little acid or base or even water and stable for longer period. It also maintain a relatively constant pH in a solution as well as constant internal environment.

Koushik Mondal

pH=4 for acidic, 7 for neutral and 9.2 for basic regions. These are all standard and well-known buffer solutions.