The reduction potential Zn is_________________?
Correct answer: B. -0.76
- A. 0.76
- B. -0.76
- C. -0.55
- D. 0.55
Explanation
The standard reduction potential of Zn2+ + 2e- -> Zn is -0.76 V when measured relative to the standard hydrogen electrode. The negative value shows that zinc ions have less tendency to accept electrons than hydrogen ions under standard conditions. The likely mistake is choosing +0.76 V, which is the corresponding standard oxidation potential for Zn -> Zn2+ + 2e-.
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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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