Question

half-reaction | e° (v) a⁺ + e⁻→ a | -0.5 b⁺ + e⁻ → b | 0.0 c⁺ + e⁻→ c | +1.0 which substance acts as the standard in this data set? they are all equally likely to be reduced. substance a substance c substance b

Explanation:

In standard reduction potential (E°) data, the standard reference for reduction potentials is the standard hydrogen electrode (SHE) with E° = 0.0 V. Here, the half - reaction for \( B^+ + e^-
ightarrow B \) has an E° of 0.0 V, which is consistent with the standard (like SHE). So Substance B acts as the standard here. Also, the likelihood of reduction depends on E° (higher E° means more likely to be reduced), so they are not equally likely. Substance A has negative E° (less likely to be reduced than B), Substance C has positive E° (more likely than B), but for the standard, B's E° is 0.0 V.

Answer:

Substance B