QUIZ #3

Question 1: Which of these compounds will produce the most acidic solution when 0.1 mol is dissolved in 100 mL of solution? (Refer to the data page for helpful information.)

H₃PO₄
CH₃COOH
HClO
HCOOH
CCl₃COOH

Question 2: Which of these compounds will produce the least basic solution when 0.1 mol is dissolved in 100 mL of solution? (Refer to the data page for helpful information.)

C₆H₅NH₂
NaCN
Na₃PO₄
KClO₂
NH₃

Question 3: Sulfuric acid, H₂SO₄, is 18.0 M in its most concentrated form. If 10.0 mL of conc. H₂SO₄ is added to enough water to make 1.00 L of solution, what is the pH?

0.18
0.74
13.26
1.71
-0.74

Question 4: 13.05 g of KOH is dissolved to produce 500 mL of solution. What is the resulting pH?

13.37
0.332
0.465
13.668
13.535

Question 5: Calculate the pH of a solution obtained by dissolving 0.0900 mol of morphine in water and diluting it to a volume of 600 mL. (Refer to the data page for helpful information.)

8.20
3.31
11.50
10.69
5.80

Question 6: A sample of HCN gas was bubbled through 10.0 mL of water until 54.5 mg was dissolved. What is the pH is the resulting solution? Assume no volume change. (Refer to the data page for helpful information.)

4.96
9.04
8.55
4.04
5.45

Question 7: 95.0 mg of trichloroacetic acid, CCl₃COOH, is dissolved in 100 mL of water. What is the percent dissociation of the acid? (Refer to the data page for helpful information.)

7.2%
98%
78%
37%
0.98%

Question 8: Cacodylic acid is used in the cotton growing industry to defoliate cotton plants. A 0.11 M solution is 0.77% dissociated. What is the K_a of cacodylic acid?

8.5x10^-2
8.5x10^-4
6.6x10^-6
7.7x10^-3
0.29

Question 9: Octylamine is a base which in a 0.010 M solution is 20% dissociated. What is the pK_a of the octylammonium ion, its conjugate acid?

3.30
10.60
0.70
10.70
3.40

Question 10: 1.5 x 10^-7 mol of nicotine is dissolved in sufficient water to make 1.0 L of solution. What is the pH of the resulting solution? (Hint: This is not an exam.) (Refer to the data page for helpful information.)

7.60
7.11
7.26
6.89
6.74