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103B PS 8 - problem set 1 Page 1 CHEMISTRY 103B Problem Set...

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Page 1 problem set 1 4/10/2008 12:18:04 AM http://www.chem.arizona.edu/~kellerp/ps-answers/PS8an/PS8an.htm CHEMISTRY 103B Problem Set 8: 12 Points Answer Key Problem 1. (two points) Balancethe complete electrontransfer equations below. Allare in acid solution. (a) IO - (aq) + N 2 H 5 + (aq) I 2 (s) + NO 3 - (aq) 14 IO - (aq) + N 2 H 5 + (aq) + 11 H + 7 I 2 (s) + 2 NO 3 - (aq) + 8 H 2 O (b) S 4 O 6 2- (aq) + NO 2 - (aq) SO 4 2- (aq) + N 2 (g) 3 S 4 O 6 2- (aq) + 14 NO 2 - (aq) + 2 H 2 O 12 SO 4 2- (aq) +7 N 2 (g) + 4 H + Problem 2. (two points) Balancethe complete electrontransfer equations below. Allare in basic solution. (a) ClO 3 - (aq) + Sn(s) Cl 2 (g) + Sn(OH) 4 (s) 4 ClO 3 - (aq) + 5 Sn(s) + 12 H 2 O 2 Cl 2 (g) + 5 Sn(OH) 4 (s) + 4 OH - (b) CrO 4 2- (aq) + NH 3 (aq) Cr(OH) 3 (s) + N 2 (g) 2 CrO 4 2- (aq) + 2 NH 3 (aq) + 2 H 2 O 2 Cr(OH) 3 (s) + N 2 (g) + 4 OH - Problem 3. (one point) Balancethe equationbelow for acid solution (you lllove it) Cr 2 O 7 2- (aq) + Fe(SCN) 6 4- (aq) Cr 3+ (aq) + Fe 3+ (aq) + CO 2 (g) + NO 3 - (aq) + SO 2 (g) Here are the two half reactions: [Cr 2 O 7 2- + 14 H + + 6e - 2 Cr 3+ + 7 H 2 O] x 85
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Page 2 problem set 1 4/10/2008 12:18:04 AM http://www.chem.arizona.edu/~kellerp/ps-answers/PS8an/PS8an.htm
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