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
S2O82-(aq) + 2H+ + 2Br-(aq) → 2HSO4-(aq) + Br2(aq)
"1.09-1.49=-0.40V"
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