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solution - Even Assigned Answers for 16 17.4(a 6[Fe 2(aq...

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Even Assigned Answers for Chapters 12, 13, 16, 17 Chapter 12 12.4 (a) 2 3 6[Fe (aq) Fe (aq) e ] + + ! " + 2 3 2 7 2 1[Cr O (aq) 14 H (aq) 6 e 2 Cr (aq) 7 H O(l)] ! + ! + + + " + 2 2 2 7 3 3 2 6 Fe (aq) Cr O (aq) 14 H (aq) 6 e 6 Fe (aq) 6 e 2 Cr (aq) 7 H O(l) + ! + ! + ! + + + + " + + + 2 2 2 7 3 3 2 6 Fe (aq) Cr O (aq) 14 H (aq) 6 Fe (aq) 2 Cr (aq) 7 H O(l) + ! + + + + + " + + 2 Fe + is the reducing agent and 2 2 7 Cr O ! is the oxidizing agent. (b) 2 5 2 3 5 [C H OH(aq) H O(l) CH COOH(aq) 4 H (aq) 4 e ] + ! + " + + 2 4 2 4 [MnO (aq) 8 H (aq) 5 e Mn (aq) 4 H O(l)] ! + ! + + + " + 2 5 2 4 2 3 2 5 C H OH(aq) 5 H O(l) 4 MnO (aq) 32 H (aq) 20 e 5 CH COOH(aq) 20 H (aq) 20 e 4 Mn (aq) 16 H O(l) ! + ! + ! + + + + + " + + + + 2 5 4 2 3 2 5 C H OH(aq) 4 MnO (aq) 12 H (aq) 5 CH COOH(aq) 4 Mn (aq) 11 H O(l) ! + + + + " + + 2 5 C H OH is the reducing agent and 4 MnO ! is the oxidizing agent. (c) The reaction is 3 2 I (aq) NO (aq) I (aq) NO(g) ! ! + " + . 2 3[2 I (aq) I (aq) 2 e ] ! ! " + 3 2 2 [NO (aq) 4 H (aq) 3 e NO(g) 2 H O(l)] ! + ! + + " + 3 2 2 6 I (aq) 2 NO (aq) 8 H (aq) 6 e 3 I (aq) 6 e 2 NO(g) 4 H O(l) ! ! + ! ! + + + " + + + 3 2 2 6 I (aq) 2 NO (aq) 8 H (aq) 3 I (aq) 2 NO(g) 4 H O(l) ! ! + + + " + + I ! is the reducing agent and 3 NO ! is the oxidizing agent. (d) 2 3 2 3 4 3[As S (s) 8 H O(l) 2 H AsO (aq) 3 S(s) 10 H (aq) 10 e ] + ! + " + + + 3 2 10 [NO (aq) 4 H (aq) 3 e NO(g) 2 H O(l)] ! + ! + + " + 2 3 3 2 3 4 2 3 As S (s) 10 NO (aq) 24 H O(l) 40 H (aq) 30 e 6 H AsO (aq) 9 S(s) 10 NO(g) 20 H O(l) 30 H (aq) 30 e ! + ! + ! + + + + " + + + + +
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2 3 3 2 3 4 3 As S (s) 10 NO (aq) 4 H O(l) 10 H (aq) 6 H AsO (aq) 9 S(s) 10 NO(g) ! + + + + " + + As 2 S 3 is the reducing agent (both As and S are oxidized ) and 3 NO ! is the oxidizing agent. 12.6 (a) 2 7 2 2 Cl O (g) 2 ClO (aq) 3 H O(l) ! " + (O’s balanced) 2 7 2 2 2 Cl O (g) 6 H O(l) 2 ClO (aq) 3 H O(l) 6 OH (aq) ! ! + " + + (H’s balanced) 2 7 2 2 Cl O (g) 3 H O(l) 8 e 2 ClO (aq) 6 OH (aq) ! ! ! + + " + (charge balanced) 2 2 2 H O (aq) O (g) ! (O’s balanced) 2 2 2 2 H O (aq) 2 OH (aq) O (g) 2 H O(l) ! + " + (H’s balanced) 2 2 2 2 H O (aq) 2 OH (aq) O (g) 2 H O(l) 2e ! ! + " + + (charge balanced) Combining the two half-reactions: 2 7 2 2 1[Cl O (g) 3 H O(1) 8 e 2 ClO (aq) 6 OH (aq)] ! ! ! + + " + 2 2 2 2 4[H O (aq) 2 OH (aq) O (g) 2 H O(l) 2 e ] ! ! + " + + 2 7 2 2 2 2 2 2 Cl O (g) 3 H O(l) 8 e 4 H O (aq) 8 OH (aq) 2 ClO (aq) 6 OH (aq) 4 O (g) 8 H O(l) 8 e ! ! ! ! ! + + + + " + + + + 2 7 2 2 2 2 2 Cl O (g) 4 H O 2 OH (aq) 2 ClO (aq) 4 O (g) 5 H O(l) ! ! + + " + + Cl 2 O 7 is the oxidizing agent and H 2 O 2 is the reducing agent. (b) 4 2 2 MnO (aq) MnO (s) 2 H O(l) ! " + (O’s balanced) 4 2 2 2 MnO (aq) 4 H O(l) MnO (s) 2 H O(l) 4 OH (aq) ! ! + " + + (H’s balanced) 4 2 2 MnO (aq) 2 H O(l) 3 e MnO (s) 4 OH (aq) ! ! ! + + " + (charge balanced) 2 S (aq) S(s) 2 e ! ! " + Combining the two half-reactions: 4 2 2 2[MnO (aq) 2 H O(l) 3 e MnO (s) 4 OH (aq)] ! ! ! + + " + 2 3[S (aq) S(s) 2 e ] ! ! " +
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