Workshop CHE 168
Answers for
Problem Set #6
 
 
 

1.

(a) 1.0 x 10^-12 M
(b) 5.0 x 10^-6 M
(c) 5 x 10^-9 M

2.

(a) acidic
(b) acidic
(c) neutral

3. ClO₄^- _(aq), HS^- _(aq), PH_{3 (aq)}, CO₃^2- _(aq)

4. HCN _(aq), HSO₄^- _(aq), H₃O⁺_(aq), H₂CO_{3 (aq)}

5. O^2- _(aq) + H₂O _(l)  OH^- _(aq) + OH^- _(aq); [acid/base]: OH^- /O^2- ; H₂O/OH^-

6. HCHO_{2 (aq)} + H₂O _(l)  H₃O⁺_(aq) + CHO₂^- _(aq); [acid/base]: HCHO₂/CHO₂^- ; H₃O⁺/H₂O

7. CN^- ; CN^- is a stronger base than F^-

8. 3.42; 10.58

9. 5.24; [H₃O⁺] = 1.7 x 10^-9 M

10. 1.40

11. 0.0022 M

12. 12.34

13.

(a) Ka = 1.8 x 10^-4
(b) 4.2%

14. 5.00; yes

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