Workshop CHE 166
Answers for
Problem Set #5
 

1.

a) Li⁺, OH^-
b) NH₄⁺, NO₃^-
c) Na⁺, CrO₄^2-
d) K⁺, Cl^-
e) Al³⁺, SO₄^2-

2. conduct electricity

3.

a) I
b) I
c) S
d) S
e) I
f) S
g) S
h) I
I) S
j) I

4.

a) W
b) S
c) S
d) W
e) N
f) S
g) N
h) W
I) S

5.

a) W/base
b) W/acid
c) S/base
d) W/acid
e) S/acid
f) W/acid
g) S/base

6. Ca(NO₃)₂

7. CaCl₂

8. No reaction.

9. Ppt. of PbI₂ will be formed.

10. 3; [1,3,3,2]

11.

a) Ppt. of Ag₂CO₃ formed

b) Ppt. of BaCO₃ formed

c) No Reaction

d) H₂S _(aq) formed; a weak electrolyte

e) Pb(C₂H₃O₂)_{2 (aq)} formed; a weak electrolyte

12. +7

13. - 2

14. +6

15. A Group IV element; thus, +4

16. 6 e^- + 14 H⁺ _(aq) + Cr₂O₇^2- _(aq) ® 2 Cr³⁺ _(aq) + 7 H₂O _(l)

17. 16 H⁺ _(aq) + 2 MnO₄^- _(aq) + 10 Br^- _(aq) ® 5 Br_{2 (aq)} + 2 Mn²⁺ _(aq) + 8 H₂O _(l)

MnO₄^-: Oxidizing agent and substance reduced.

Br^-: Reducing agent and substance oxidized.

18. 6 H₂O _(l) + 3 H⁺ _(aq) + 4 As _(s) + 3 ClO₃^- _(aq) ® 3 HClO _(aq) + 4 H₃AsO_{3 (aq)}
ClO₃^-: Oxidizing agent and substance reduced.
As: Reducing agent and substance oxidized.

19. 2 Ag⁺ _(aq) + H₂O_{2 (aq)} ® O_{2 (g)} + 2 Ag _(s) + 2 H⁺ _(aq)
Ag⁺: Oxidizing agent and substance reduced.

H₂O₂: Reducing agent and substance oxidized.

20. 2 e^- + H₂O (l) + ClO^- (aq) ® Cl^- (aq) + 2 OH^- (aq)

21. 3 Bi(OH)_{3 (s)} + 3 SnO₂^2- _(aq) ® 3 SnO₃^2- _(aq) + 2 Bi _(s) + 3 H₂O _(l)

Bi(OH)₃: Oxidizing agent and substance reduced.

SnO₂^2-: Reducing agent and substance oxidized.

22. H₂O _(l) + 2 MnO₄^- _(aq) + I^- _(aq) ® IO₃^- _(aq) + 2 MnO_{2 (s)} + 2 OH^- _(aq)

MnO₄^-: Oxidizing agent and substance reduced.

I ^-: Reducing agent and substance oxidized.

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