Discussion
A glass electrode responds to hydrogen ion activity because a potential develops across
Answer: C
Correct answer: a thin glass membrane between two solutions
The glass electrode is a bulb of special glass containing a solution of fixed pH with an internal reference electrode. A potential develops across the thin membrane that depends on the difference in hydrogen ion activity between the two sides, so with the inside fixed the potential measures the outside. The membrane is fragile and must be kept hydrated for the ion exchange layer to function.
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