Discussion
Match the electrode with what it is used for.
1. Standard hydrogen electrode 2. Calomel electrode 3. Glass electrode
P. Convenient laboratory reference Q. Primary reference of zero potential R. Measurement of pH
Answer: B
The hydrogen electrode defines the scale but is awkward to use, calomel replaces it in practice, and the glass electrode is the indicator electrode for hydrogen ion activity. All three appear together in a pH measurement's history.
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