In the reaction Cl2(g) + S2O3^2−(aq) → Cl−(aq) + SO4^2−(aq) in acidic solution, which species is the reducing agent?

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Multiple Choice

In the reaction Cl2(g) + S2O3^2−(aq) → Cl−(aq) + SO4^2−(aq) in acidic solution, which species is the reducing agent?

Explanation:
In a redox reaction, the reducing agent is the species that donates electrons and is oxidized. Here, thiosulfate ion is transformed into sulfate, so its oxidation state increases (sulfur goes from a lower average oxidation state toward +6 in sulfate). That means thiosulfate loses electrons to Cl2, which is reduced to Cl−. Since thiosulfate supplies electrons, it is the reducing agent.

In a redox reaction, the reducing agent is the species that donates electrons and is oxidized. Here, thiosulfate ion is transformed into sulfate, so its oxidation state increases (sulfur goes from a lower average oxidation state toward +6 in sulfate). That means thiosulfate loses electrons to Cl2, which is reduced to Cl−. Since thiosulfate supplies electrons, it is the reducing agent.

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