Discussion
Statement I: A pH meter must be recalibrated after the electrode is replaced.
Statement II: Calibration corrects for the asymmetry potential and slope of that particular electrode.
In the light of the above statements, choose the correct answer.
Answer: A
Both hold, and the second is why the first is necessary. Every electrode has its own offset and its own slope, both of which drift as it ages, so a calibration belongs to an electrode and not to a meter. Good practice recalibrates daily in routine work and immediately after any change of electrode, filling solution or measuring temperature. Recording the slope at each calibration also gives an early warning of an electrode approaching the end of its life.
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