Name ____________________________________________________
Unit 8: Solutions
1. NaCl (aq) is best classified as a
(1) homogeneous compound
(3) heterogeneous compound
Date ________________________________
Multiple Choice Questions
(2) homogeneous mixture
(4) heterogeneous mixture
2. Which ionic compound dissolves in water to form a colored solution?
(1) Ca(NO3)2
(2) Cu(NO3)2
(3) KNO3
(4) Al(NO3)3
3. In a true solution, the dissolved particles
(1) are visible to the eye
(2) will settle out on standing
(3) are always solids
(4) cannot be removed by filtration
4. When a mixture of water, sand, and salt is filtered, what passes through the filter
paper?
(1) water only
(2) water and sand only
(3) water and salt only
(4) water, sand, and salt
5. Which compound is insoluble in water?
(1) BaSO4
(2) CaCrO4
(3) KClO3
(4) Na2S
6. Which substance is most soluble in water?
(1) (NH4)3PO4
(2) Cu(OH)2
(3) Ag2SO4
(4) CaCO3
7. Potassium chloride dissolved in pure water is an example of
(1) an ionic solute dissolved in a polar solvent
(2) an ionic solute dissolved in a nonpolar solvent
(3) a covalent solute dissolved in a polar solvent
(4) a covalent solute dissolved in a nonpolar solvent
8. Nonpolar solvents will most easily dissolve solids that are
(1) ionic
(2) covalent
(3) metallic
(4) colored
9. What happens when NaCl (s) is dissolved in water?
(1) Cl- ions are attracted to the oxygen atoms of the water
(2) Cl- ions are attracted to the hydrogen atoms of the water
(3) Na+ ions are attracted to the hydrogen atoms of the water
(4) no attractions are involved, the crystal just falls apart
10. What change will cause the solubility of KNO3 (s) to increase?
(1) decreasing the pressure
(2) increasing the pressure
(3) decreasing the temperature
(4) increasing the temperature
11. A decrease in pressure has the greatest effect on a solution that contains
(1) a gas in a liquid
(2) a liquid in a liquid
(3) a solid in a solid
(4) a solid in a liquid
12. Under which conditions are gases most soluble in water?
(1) high temperature and high pressure
(2) high temperature and low pressure
(3) low temperature and high pressure
(4) low temperature and low pressure
13. At standard pressure, what is the temperature at which a saturated solution of NH 4Cl
has a concentration of 60 g NH4Cl/100 g H2O?
(1) 66C
(2) 57C
(3) 22C
(4) 17C
14. What is the mass of NH4Cl that must dissolve in 200 grams of water at 50C to make a
saturated solution?
(1) 26 g
(2) 42 g
(3) 84 g
(4) 104 g
15. When 5 grams of KCl are dissolved in 50 grams of water at 25C, the resulting mixture
can be described as
(1) heterogeneous and unsaturated
(2) heterogeneous and supersaturated
(3) homogeneous and unsaturated
(4) homogeneous and supersaturated
16. One hundred grams of water is saturated with NH4Cl at 50C. If the temperature is
lowered to 10C, what is the total amount of solute that will precipitate?
(1) 5 g
(2) 17 g
(3) 30 g
(4) 50 g
17. What is the molarity of 1.5 L of an aqueous solution that contains 52 g of LiF (gram
formula mass = 26 g/mole).
(1) 1.3 M
(2) 2.0 M
(3) 3.0 M
(4) 0.75 M
18. What is the total number of moles of solute in 250 mL of a 1.0 M solution of NaCl?
(1) 1.0 mole
(2) 0.25 mole
(3) 0.5 mole
(4) 42 moles
19. What is the total mass of NaI (s) needed to make a 1 L of a 0.01 M solution?
(1) 0.015 g
(2) 0.15 g
(3) 1.5 g
(4) 15 g
20. When 20 mL of 1 M HCl is diluted to a total volume of 60 mL, the concentration of the
resulting solution is
(1) 1.0 M
(2) 0.50 M
(3) 0.33 M
(4) 0.25 M
21. Parts per million is used to express the
(1) atomic mass of an element
(3) volume of a substance
(2) concentration of a solution
(4) rate of heat transfer
22. An aqueous solution has a mass of 490 grams containing 8.5 x 10-3 gram of calcium
ions. The concentration of calcium ions in this solution is
(1) 4.3 ppm
(2) 8.5 ppm
(3) 17 ppm
(4) 34 ppm
23. Which sample, when dissolved in 1.0 liter of water, produces a solution with the
highest boiling point?
(1) 0.1 mole KI
(2) 0.2 mole KI
(3) 0.1 mole MgCl2
(4) 0.2 mole MgCl2
24. Which aqueous solution has the highest boiling point at standard pressure?
(1) 1 M KCl
(2) 1 M CaCl2
(3) 2.0 M KCl
(4) 2.0 M CaCl2
25. Compared to pure water, an aqueous solution of calcium chloride has a
(1) higher boiling point and higher freezing point
(2) higher boiling point and lower freezing point
(3) lower boiling point and higher freezing point
(4) lower boiling point and lower freezing point