What is the standard reduction potential assigned to the Standard Hydrogen Electrode (SHE) at all temperatures?
Answer and explanation
Correct answer: B. 0.00 Volts by convention
- Step 1: Absolute electrode potentials cannot be measured independently; only differences can be determined. Step 2. By international convention, the standard hydrogen electrode (2 H+ + 2 e- <=> H2 at 1 atm, 1 M H+) is assigned a reference reduction potential of exactly 0.00 V. Answer: 0.00 Volts by convention. Why not the others: 1.00 Volt is an arbitrary positive reference; -1.00 Volt is a negative potential; 0.50 Volts represents an arbitrary non-zero potential.
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