Topic 10 Practice - Solutions
1. Which compound is insoluble in water?
A) calcium bromide
C) silver bromide
B) potassium bromide
D) sodium bromide
2. Which ion, when combined with chloride ions, Cl –,
forms an insoluble substance in water?
A) Fe 2+
B) Mg 2+ C) Pb2+
D) Zn2+
3. Which compound becomes less soluble in water as the
temperature of the solution is increased?
A) HCl
C) NaCl
B) KCl
D) NH 4Cl
4. An unsaturated aqueous solution of NH3 is at 90°C in
100. grams of water. According to Reference Table G,
how many grams of NH3 could this unsaturated solution
contain?
A) 5 g
B) 10. g
C) 15 g
D) 20. g
5. Carbon dioxide gas is most soluble in water under
conditions of
A)
B)
C)
D)
high pressure and low temperature
high pressure and high temperature
low pressure and low temperature
low pressure and high temperature
6. A student adds solid KCl to water in a flask. The flask is
sealed with a stopper and thoroughly shaken until no
more solid KCl dissolves. Some solid KCl is still visible
in the flask. The solution in the flask is
A) saturated and is at equilibrium with the solid
KCl
B) saturated and is not at equilibrium with the solid
KCl
C) unsaturated and is at equilibrium with the solid KCl
D) unsaturated and is not at equilibrium with the solid
KCl
7. What is the mass of NH 4Cl that must dissolve in 200.
grams of water at 50.°C to make a saturated solution?
A) 26 g
B) 42 g
C) 84 g
D) 104 g
8. What is the molarity of 1.5 liters of an aqueous solution
that contains 52 grams of lithium fluoride, LiF,
(gram-formula mass = 26 grams/mole)?
A) 1.3 M
C) 3.0 M
B) 2.0 M
D) 0.75 M
9. What is the total number of grams of NaI(s) needed to
make 1.0 liter of a 0.010 M solution?
A) 0.015 B) 0.15
C) 1.5
D) 15
10. A 2400.-gram sample of an aqueous solution contains
0.012 gram of NH 3. What is the concentration of NH 3
in the solution, expressed as parts per million?
A) 5.0 ppm
C) 20. ppm
B) 15 ppm
D) 50. ppm
11. Which aqueous solution of KI freezes at the lowest
temperature?
A)
B)
C)
D)
1 mol of KI in 500. g of water
2 mol of KI in 500. g of water
1 mol of KI in 1000. g of water
2 mol of KI in 1000. g of water
12. Compared to a 2.0 M aqueous solution of NaCl at 1
atmosphere, a 3.0 M aqueous solution of NaCl at 1
atmosphere has a
A)
B)
C)
D)
lower boiling point and a higher freezing point
lower boiling point and a lower freezing point
higher boiling point and a higher freezing point
higher boiling point and a lower freezing point
Answer Key
Topic 10 - Solutions
1.
C
2.
C
3.
A
4.
A
5.
A
6.
A
7.
D
8.
A
9.
C
10.
A
11.
B
12.
D