Discussion
What is meant by the slope of a pH electrode?
Answer: D
Slope is the measured millivolts per pH unit, expressed as a percentage of the theoretical 59.16. A new electrode gives 98 to 100 per cent; below about 92 per cent it should be replaced, because the response has become compressed and readings far from the calibration points will be wrong. Drift with time is a separate symptom, usually of a fouled junction, mounting angle matters only for the electrolyte level, and buffer temperature behaviour is tabulated separately. Slope and offset together are what a two point calibration determines.
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