Element | Oxidation no. in reactant | Oxidation no. in products |
Zn | 0 | +2 |
N | + 5 | 0 |
O | -2 | -2 |
oxidation half reaction : Zn (s) Zn 2+ (aq)
reduction half reaction :NO 3- (aq) N 2 (g)
Balance the half equations for atoms other than O and H.
oxidation half reaction : Zn (s) Zn 2+ (aq)
reduction half reaction : 2 NO 3- (aq) N 2 (g)
Balance half equations for O atoms by adding H2O to the side of half equation with less number of O atoms.
oxidation half reaction : Zn (s) Zn 2+ (aq)
reduction half reaction : 2 NO 3- (aq) N 2 (g) + 6 H2O
Balance half equations for H atoms by adding H+ to the side of half equations with less number of H atoms.
oxidation half reaction : Zn (s) Zn 2+ (aq)
reduction half reaction : 2 NO 3- (aq)+ 12 H+ N 2 (g) + 6 H2O
Balance above equations for charge by adding electrons.
oxidation half reaction : Zn (s) Zn 2+ (aq) + 2 e -
reduction half reaction :2 NO 3- (aq)+ 12 H+ + 10 e - N 2 (g) + 6 H2O
To make number electrons equal in both half equations, multiply oxidation by 5.
oxidation half reaction : 5 Zn (s) 5 Zn 2+ (aq) + 10 e -
reduction half reaction :2 NO 3- (aq)+ 12 H+ + 10 e - N 2 (g) + 6 H2O
Add two half equations
5 Zn (s) 5 Zn 2+ (aq) + 10 e -
2 NO 3- (aq)+ 12 H+ + 10 e - N 2 (g) + 6 H2O
Overall equation : 5 Zn (s) + 2 NO 3- (aq)+ 12 H+ 5 Zn 2+ (aq) + N 2 (g) + 6 H2O
Balanced oxidation half equation : 5 Zn (s) 5 Zn 2+ (aq) + 10 e -
Balanced reduction half equation : 2 NO 3- (aq)+ 12 H+ + 10 e - N 2 (g) + 6 H2O
5. (12 points) For the following oxidation reduction reaction: Zn(s)+NO3 (aq) > Zn2*(aq) + N2(g) +...
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