1.
What is the main function of a buffer solution?
A. to neutralize acids
B. to resist changes in pH
C. to maintain solution neutrality
D. to prevent acids from mixing with bases
2.
Which of the following would be used to prepare an acidic buffer solution?
A. HF and H
3
O +
B. H
2
S and NaHS
C. NH
3
and NH
4
Cl
D. HNO
3
and NaNO
3
3.
Oxalic acid dihydrate is a pure, stable, crystalline substance. Which of the following describes one of its uses in acid-base titrations?
A. buffer
B. primary standard
4.
C. chemical indicator
D. stoichiometric indicator
Consider the following buffer equilibrium system:
H
2
CO
3
(aq) + H
2
O(l) ⇌ H
3
O + (aq) + HCO
3-
(aq)
What is the net result of adding a small amount of HCl ?
A. The [H
3
O + ] increases slightly.
B. The pH remains the same.
C. The pH increases slightly.
5.
D. The [H
2
CO
3
] decreases slightly.
Consider the following buffer equilibrium system:
HCN(aq) + H
2
O(l) ⇌ H
3
O + (aq) + CN (aq)
What is the net result of adding a small amount of KOH ?
A. The pH increases slightly.
B. The pH decreases slightly.
C. The [HCN] increases slightly.
D. The [CN ] decreases slightly.

6.
Which of the following equations correctly represents the reaction of a metallic oxide with water?
A. K
2
O + H
2
O → 2KOH
B. SO
3
+ H
2
O → H
2
SO
4
C. Na
2
O + H
2
O → Na
2
O
2
+ H
2
D. NaOH + H
2
O → Na + 2H
2
O
7.
Which of the following represents a reaction that can occur between a non-metallic oxide and water?
A. SO
2
+ H
2
O ⇌ H
2
SO
3
8.
B. Na
2
O + H
2
O ⇌ 2NaOH
C. CaO + H
2
O ⇌ Ca(OH)
2
D. NO
2
+ H
2
O ⇌ H
2
NO + O
2
An oxide of which of the following elements will form a basic solution?
A. P
B. N
C. K
D. C
9.
A. P
B. N
An oxide of which of the following elements will form a solution that acts only as a base?
10.
Four samples of rain are collected from different geographic regions and the pH is measured for each sample.
C. Zn
D. Ba
Sample pH
1
2
3
2.8
4
6.2
4 6.8
Which of the above samples would be classified as acid rain?
A. 1 only
B. 1 and 2
C. 1, 2 and 3
D. 1, 2, 3 and 4