How to Calibrate and Use a pH Meter: 12 Steps (with …
2021-7-29 · You will generally need more than one buffer for calibrating a pH meter. The first will be a 'neutral' buffer with a pH of 7, and the second should be near the expected sample pH, either a pH of 4 or 9.21. Buffers with a higher pH (9.21) are best for measuring bases, whereas buffers with a low pH (4) are best for measuring acidic samples.
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