Gen. Chem.- Chap. 13
Choose the correct answer for each question.
 

1The [H+] of tomato juice is 2.5 x 10-5M. Calculate the pH. Is this solution acidic, basic, or neutral?
4.60, acidic
4.60, basic
5.67, acidic
5.67, basic

2The pH of a household ammonia cleaner is about 11.75. Calculate the [H+] of the solution.
1.17 x 10-3M
5.63 x 10-7
7.79 x 10-11
1.78 x 10-12M

3Lime juice has an [H+] = 1.26 x 10-2M. What is the [OH-]? (Kw= 1 x 10-14)
1.26 x 10-2M
4.57 x 10-4M
1.26 x 10-11M
7.94 x 10-13M

4The Kb expression for ammonia, NH3 is...
{[NH4+] [OH-]} / [NH3]
[NH3] / {[NH2-] [H+]}
[NH4+] / {[H+] [NH3]}
{[H+]3 [N3-]} / [NH3]

5Which of the following are acid-base conjugate pairs?
H+ / OH-
H2PO4- / HPO42-
H+ / F-
CH3COOH / NH3

6Calculate the pH of a 0.01 M NaOH solution.
0.01
1
2
12

7Calculate the pH of a 0.05 M solution of lactic acid. (Ka HLac = 1.37 x 10-4)
HLac(aq) <---> H+(aq) + Lac-(aq)
1.30
2.59
3.86
5.55

8The pH of a 0.1M solution of formic acid (HCOOH) is 2.39. Calculate the Ka for formic acid.
HCOOH (aq) <-----> H+ (aq) + HCOO- (aq)
1.0 x 10-1
4.07 x 10-3
1.77 x 10-4
8.82 x 10-6

9Calculate the pH of a 0.1 M solution of cocaine. Kb = 2.6 x 10-6
Coc + H2O <-----> HCoc+ + OH-
3.29
9.50
10.7
12.1

10When CoCl2 is dissolved in water, the solution will be...
acidic
basic
neutral
cannot be determined