Sabtu, 01 Agustus 2009

HYDROLISIS QUIZ

1. Which salt dissolved in water will give the highest pH?
a. NaCl
b. KBr
c. NaNO3
d. NH4Cl
e. NaF

2. The Ka of the weak acid HNO2 is 7.4 x 10-4. What is the Kb of its conjugate base, NO2-?
a. 7.4 x 10-4
b. 1.35 x 103
c. 1.35 x 10-11
d. 1.0 x 10-14
e. 1.8 x 10-5

3. What is the hydrolysis constant of the OBr- ion? The ionization constant of HOBr is 2.0 x 10-9.
a. 5.0 x 10-5
b. 5.0 x 10-6
c. 2.0 x 10-6
d. 5.0 x 10-9
e. 2.0 x 10-4

4. What is the hydroxide ion concentration of 0.110 M OCl-? The ionization constant of HOCl is 3.0 x 10-8.
a. 3.0 x 10-8
b. 5.1 x 10-4
c. 5.1 x 10-5
d. 1.7 x 10-4
e. 1.9 x 10-4

5. What is the hydronium ion concentration in a 0.440 M OI- solution? (Ka HOI = 2.0 x 10-11)
a. 6.7 x 10-13
b. 4.5 x 10-6
c. 3.3 x 10-3
d. 3.3 x 10-12
e. 8.0 x 10-12

6. What is the hydronium ion concentration of a 0.04 M solution of Ni2+ solution of nickel(II) perchlorate? The acidity constant of the following reaction is 5x10-10.
Ni2+(aq) + 2 H2O
Ni(OH)+(aq) + H3O+
a. 1 x 10-5
b. 1 x 10-4
c. 4 x 10-6
d. 2 x 10-5
e. 4 x 10-5

7. What is the hydronium ion concentration of a 0.1 M solution of Zn2+ solution of zinc perchlorate? The acidity constant of the following reaction is 3 x 10-10.
Zn2+(aq) + 2 H2O
Zn(OH)+(aq) + H3O+
a. 5 x 10-5
b. 2 x 10-4
c. 5 x 10-6
d. 2 x 10-6
e. 2 x 10-5

8. Consider the following salts. Which one(s) when dissolved in water will produce a neutral solution?
1) CoBr2
2) (NH4)2S
3) CaBr2
a. 2 and 3
b. only 2
c. only 1
d. 1 and 2
e. only 3

9. Consider the following salts. Which one(s) when dissolved in water will produce an acidic solution?
1) NH4Cl
2) KHSO4
3) NaCN
a. only 1
b. 2 and 3
c. only 3
d. only 2
e. 1 and 2

10. Consider the following salts. Which one(s) when dissolved in water will produce a basic solution?
1) NaNO3
2) K2S
3) Na2CO3
a. only 3
b. only 1
c. 1 and 2
d. only 2
e. 2 and 3

11. What is the pH of a 0.10 M C6H5O- solution? The Ka of C6H5OH is 1.0x10-10
a. 11.50
b. 10.51
c. 10.82
d. 11.20
e. 11.04

12. Sodium propionate, NaC3H7O2, is used as a food preservative. Calculate the pH of a 0.20 M solution of sodium propionate given Ka = 3.4 x 10-5 for propionic acid.
a. 8.89
b. 7.92
c. 7.64
d. 8.61
e. 9.22

13. What is the pH of a 0.68 M CN- solution? (Ka of HCN = 4.4 x 10-10)
a. 11.60
b. 11.10
c. 10.80
d. 11.30
e. 10.60

14. What is the pH of a 0.44 M OI- solution? (Ka of HOI=2.0x10-11)
a. 12.17
b. 12.46
c. 11.62
d. 11.83
e. 12.01

15. What is the molarity of a potassium hydroxide solution if 50.0 mL of it neutralizes 25.0 mL of a .250 M solution of sulfuric acid?
a. 0.10 M
b. 0.15 M
c. 0.20 M
d. 0.25 M
e. 0.30 M

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