Balance the following redox equations by the ion-electron method: Says they\'re

Question

Balance the following redox equations by the ion-electron method: Says they're wrong?? But I think they're right...

Balance the following redox equations by the ion-electron method: Says they're wrong?? But I think they're right... Be sure to answer all parts. Balance the following redox equations by the ion-electron method: You do not need to enter the states of the species. (a) Br2 right arrow BrO3^- + Br^- (in basic solution) 3H2O + 6Br2 right arrow 5Br^- + BrO3^- + 6H^+ (b) S2O3^2- + I2 right arrow I^- + S4O6^2- (in acidic solution) 2(S2O3)^2- + I2 right arrow (S4O6)^2- + 2I^-

Explanation / Answer

a) Br2 + 6OH- ----> BrO3 - + 3H2O + 5e-

Br2 + 2e- ----> 2Br-

so the balanced equaiton is

7Br2 + 12OH- ----> 2BrO3- + 6H2O + 10 Br-

b) 2S2O3 2- ---> S4O6 2- +2e-

I2 +2e- ---> 2I-

so 2S2O3 2- + I2 ---> 2I- + S4O6

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