Balance the following redox equation using the half-reaction method, assuming acidic
conditions: (4)
Solution
oxidation half reation reduction half reaction
V^2+ (aq) -----------> VO3^- (aq) Cd^2+ (aq) -------------
--> Cd(s)
V^2+ (aq)+3H2O(l) -----------> VO3^- (aq) Cd^2+ (aq) ---------------
> Cd(s)
V^2+ (aq)+3H2O(l) -----------> VO3^- (aq) +6H^+(aq) Cd^2+ (aq) ---------------
> Cd(s)
V^2+ (aq)+3H2O(l) -----------> VO3^- (aq) +6H^+(aq) +3e^- Cd^2+ (aq) +2e^- -------
--------> Cd(s)
2V^2+ (aq)+6H2O(l) -----------> 2VO3^- (aq) +12H^+(aq) +6e^-
3Cd^2+ (aq) +6e^- ---------------> 3Cd(s)
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2V^2+ (aq)+6H2O(l)+ 3Cd^2+ (aq) -----------------> 2VO3^- (aq) +12H^+(aq) + 3Cd(s)