Discussion
What is the asymmetry potential of a glass electrode?
Answer: A
Even with the same solution inside and out, a small potential remains because the two faces of the membrane are never identical in strain, composition or degree of hydration. It changes slowly as the electrode ages, and cancelling it is precisely what the offset adjustment of a calibration does. That is the reason a pH meter cannot simply be built to an absolute scale and must be standardised against buffers before each session of work.
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