Chem 162-2010 homework 12th week

Chem 162-2010 homework 12th week - Chem 162-2010 Hill &...

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Oxidation-Reduction Reactions 25. Complete and balance the following half-equations, and indicate whether oxidation or reduction is involved. (a) HNO 2 (aq) → NO 2 (g) (acidic solution) HNO 2 (aq) → NO 2 (g) + H + HNO 2 (aq) → NO 2 (g) + H + + 1e - = oxidation (b) PbO 2 (s) → PbO(s) (acidic solution) PbO 2 (s) → PbO(s) + H 2 O PbO 2 (s) + 2H + → PbO(s) + H 2 O PbO 2 (s) + 2H + + 2e - → PbO(s) + H 2 O = reduction (c) CH 3 CH 2 OH(aq) → CO 2 (g) (basic solution) CH 3 CH 2 OH(aq) → 2CO 2 (g) CH 3 CH 2 OH(aq) + 3H 2 O → 2CO 2 (g) CH 3 CH 2 OH(aq) + 3H 2 O → 2CO 2 (g) + 12H + CH 3 CH 2 OH(aq) + 3H 2 O → 2CO 2 (g) + 12H + + 12e - CH 3 CH 2 OH(aq) + 3H 2 O +12OH - → 2CO 2 (g) + 12H + + 12e - + 12OH - CH 3 CH 2 OH(aq) + 3H 2 O +12OH - → 2CO 2 (g) + 12H 2 O + 12e - CH 3 CH 2 OH(aq) +12OH - → 2CO 2 (g) + 9H 2 O + 12e - = oxidation 27. Use the half-reaction method to balance the following redox equations in acidic solution. (a) Fe 2+ (aq) + Cr 2 O 7 2- (aq) → Fe 3+ (aq) + Cr 3+ (aq) 6(Fe 2+ → Fe 3+ + 1e - ) Cr 2 O 7 2- + 14H + +6e - → 2Cr 3+ + 7H 2 O 6Fe 2+ (aq) + Cr 2 O 7 2- (aq) + 14H + → Fe 3+ (aq) + 2Cr 3+ (aq) + 7H 2 O (b) S 8 (s) + O 2 (g) → SO 4 2- (aq) S 8 + 32H 2 O → 8SO 4 2- + 64H + + 48 e - 12(O 2 + 4H + + 4e - → 2H 2 O) S 8 + 32H 2 O + 12O 2 + 48H + → 8SO 4 2- + 64H + + 24H 2 O S 8 + 8H 2 O + 12O 2 → 8SO 4 2- + 16H + (c) Fe 3+ (aq) + NH 2 OH 2 + (aq) → Fe 2+ (aq) + N 2 O(g) 4(Fe 3+ + 1e - → Fe 2+ ) 2NH 2 OH 2 + → N 2 O(g) + H 2 O + 6H + + 4e - 4Fe 3+ + 2NH 2 OH 2 + → 4Fe 2+ + N 2 O + H 2 O + 6H + 29. Use the half-reaction method to balance the following equations in basic solution. (a) Fe(OH) 2 (s) + O 2 (g) → Fe(OH) 3 (s) 4(Fe(OH) 2 +H 2 O → Fe(OH) 3 + H + + 1e - ) O 2 (g) +4H + + 4e - → 2H 2 O 4Fe(OH) 2 + 4H 2 O + O 2 + 4H + → 4Fe(OH) 3 + 4H + + 2H 2 O 4Fe(OH) 2 + 2H 2 O + O 2 → 4Fe(OH) 3 1
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(b) S 8 (s) → S 2 O 3 2- (aq) + S 2- (aq) S 8 + 12H 2 O → 4S 2 O 3 2- + 24H + + 16e - S 8 + 16e - → 8S
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Chem 162-2010 homework 12th week - Chem 162-2010 Hill &...

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