The half-equation method separates the oxidation and reduction of a redox reacti
ID: 917272 • Letter: T
Question
The half-equation method separates the oxidation and reduction of a redox reaction in half reactions. Overall scheme for the half reaction method: Step 1 : Split reaction into half-reactions (reduction and oxidation) Step 2: Balance the charge or oxidation number with electrons Step 3: Balance O by adding H20 Step 4: Balance H by adding H* Step 5: Multiply by some integer to make electrons (lost) = electrons (gained) Step 6: Add half equations and cancel substances on both sides Step 7: (only in basic solution): add OH" and cancel H.0 Step 8: Check atom balance and charge balance on both sides of the equation!!!! Complete and balance the following redox reactions (skeleton equations) using the half-equation method: Zn(s) + H+(aq) => Zn^2+,,,, + H2(g) (acidic solution)Explanation / Answer
1)
Zn(s) - 2 e- -------> Zn2+(aq) (oxidation)
2H+ + 2 e- -------> H2 (g) (reduction)
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Zn(s) + 2 H+ -------> Zn2+(aq) + H2(g) (Overall reaction)
2)
I- (aq) +NO3- (aq) -------> I2(s) + NO2(g) (acidic medium)
2I-(aq) - 2e- -------> I2(s) (oxidation)
2NO3-(aq) + 2e- --------> 3NO2(g) (reduction)
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2I- (aq)+ 2NO3-(aq) -------> I2(s) + 3NO2(g) (overall reaction)
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