Question

The redox reaction of peroxydisulfate with bromide has been used for many years as part of a demonstration. If E° _cell = 1.49 V and E° _bromine = 1.09 V, what is E° _{peroxydisulfate}

S₂O₈^2-(aq) + 2H⁺ + 2Br^-(aq) → 2HSO₄^-(aq) + Br₂(aq)

1. 0.40 V
2. 2.58 V
3. -0.40 V
4. -2.58 V

Answer 1

$1.09-1.49=-0.40V$