The oxidation reaction that takes place in the SHE is?
Correct answer: A. H2(gas) ⟶ 2H+(aq) + 2e-
- A. H2(gas) ⟶ 2H+(aq) + 2e-
- B. 2H2O(I) → 2H2(g) + O2(g)
- C. 2H+(aq) + 2e- → H2(gas)
- D. 2H2O(I) + 2e- → OH-(aq) + H2(g)
Explanation
The Standard Hydrogen Electrode (SHE) serves as a reference for measuring electrode potentials. In the SHE, hydrogen gas (H2) undergoes oxidation, losing electrons to form hydrogen ions (H+). This oxidation reaction is represented by the equation: H2(g) ⟶ 2H+(aq) + 2e-. Option A correctly represents this process.Option B describes the electrolysis of water, not related to the SHE. Option C is the reverse reaction, representing reduction, not oxidation. Option D involves a different reaction where water is reduced, irrelevant to the SHE.
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Electrochemistry describes electron transfer through oxidation and reduction, identifies oxidizing and reducing agents, and applies oxidation numbers to balance redox equations. It also covers electrode potential and the standard hydrogen electrode, which provides the reference for comparing the reduction tendencies of other electrodes.
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