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