In: Chemistry
Balance the following oxidation-reduction reactions using the half-reaction method.
a) S2-(aq) + NO3-(aq) ---> S8(s) + NO2(g) acidic solution
b) MnO4-(aq) + I-(aq) ---> MnO2(s) + IO3-(aq) basic solution
c) Sb(s) + H2SO4(aq) ---> Sb2(SO4)3(s) + SO2(g) acidic solution
(a). 8S2- (aq) S8 (s) + 16e-
16NO3-(aq) + 32H+ + 16 e- 16NO2 (g) + 16H2O
8S2-(aq) + 16NO3-(aq) + 32H+ S8(s) + 16NO2(g) + 16H2O
(b). 2MnO4- (aq) + 4H2O + 6e- 2MnO2 (s) + 8OH-
I- (aq) + 6OH- IO3-(aq) + 3H2O + 6e-
2MnO4-(aq) + I-(aq) + H2O 2MnO2 (s) + IO3- (aq) + 2OH-
(c). Sb (s) + 3H2SO4 (aq) Sb(SO4)3(s) + 6H+ + 6e-
3H2SO4(aq) + 6H+ + 6e- 3SO2 (g) + 6H2O
Sb(s) + 6H2SO4(aq) Sb(SO4)3(s) + 3SO2 (g) + 6H2O