The electrode potential of the standard hydrogen electrode is assigned a value of
Correct answer: A. 0.00 volts by convention
- A. 0.00 volts by convention
- B. 1.00 volt
- C. minus 1.00 volt
- D. 0.76 volts
Explanation
No single electrode potential can be measured in isolation, so the hydrogen electrode is defined as zero and every other potential is quoted relative to it. The value 0.76 volts is the standard potential of the zinc electrode measured against it, which is why it appears as a distractor. The conditions specified are 1 molar hydrogen ions, 1 atmosphere of hydrogen gas and 298 K.
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About Standard Hydrogen Electrode
The standard hydrogen electrode provides the reference potential of 0.00 V for measuring electrode potentials. It consists of platinum in contact with hydrogen gas at standard pressure and hydrogen ions at standard concentration, usually at 25°C, and can operate as either the oxidation or reduction half-cell.
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