Name___________________________ Hour____________
Chapter 13: Properties of Solutions Practice Test A
SHOW ALL WORK, INCLUDE UNITS IN THE PROBLEM AND IN FINAL ANSWER.
Objective 1: Solutions
1. Indicate the type of solute-solvent interaction that should be most
important in each of the following solutions:
a. Hexane (C6H14) in Heptane (C7H16)
b. HCl in H2O
c. Ethanol (C2H5OH) in water
d. CaCl2 in water
2. By referring to the figure below, determine whether the addition of 40 g of
each of the following ionic solids to 100 g of water at 40 C will lead to a
saturated or unsaturated solution.
a. NaNO3
___________________
b. KCl
___________________
c. KClO3
___________________
1
3. Which of the following in each pair is likely to be more soluble in water?
a. Carbon tetrachloride or Calcium Chloride
b. Acetic Acid or Barium Phosphate?
c. Benzene (C6H6) or glucose?
d. Ethyl chloride (CH3CH2Cl) or methane (CH4)
Objective 2: Concentration Expressions
1. Molarity:
a. What is the molarity of a solution made by dissolving 10 g of ammonium
sulfate into 500 mL of water?
b. What is the molarity of a solution made by diluting 250 mL of a 3.5 Molar
to 750 mL?
2. Molality:
a. What is the molality of a solution formed by dissolving 50 g of calcium
fluoride in 750 g of water?
b. What is the molality of a solution formed by dissolving 50 g of carbon
tetrachloride in 100 mL of benzene. The density of the resulting solution is
found to be 0.847 g/mL.
2
3. Integrative:
a. Ascorbic Acid (vitamin C, C6H8O6) is a water-soluble vitamin. A solution
containing 100 g of ascorbic acid dissolved in 500 g of water has a density
of 1.22 g/mL at 55 C. Calculate the
i. the molarity
ii. the molality
Objective 3: Colligative Properties
a. Calculate the effects of solute concentration on the vapor pressure, boiling point,
freezing point, and osmotic pressure of a solution.
1. What is the osmotic pressure of a solution formed by dissolving 44.2 mg
of aspirin (C9H8O4) in 0.358 L of water at 25 C?
2. The normal boiling point of CCl4 is 76.8 C and it’s Kb = 5.02 C/m.
Calculate the boiling point of a solution made by dissolving 15 g of
decane, C10H22, in 49.5 g CCl4.
3
3. Calculate the freezing point of a solution made by dissolving 13 g
potassium sulfide in 150 g H2O. Kf for water = 1.86 C/m.
b. Determine the concentration and molar mass of a nonvolatile nonelectrolyte from
its effect on the colligative properties of a solution.
1. Lauryl alcohol is obtained from coconut oil and is used to made
detergents. A solution of 5.0 g of lauryl alcohol in 0.100 kg of benzene
freezes at 4.1 C. What is the approximate molar mass of lauryl alcohol?
Benzene’s normal FP = 5.5 C and Kf = 5.12 C/m.
c. Lysozyme is an enzyme that breaks bacterial cell walls. A solution containing
0.150 g of this enzyme in 210 mL of solution has an osmotic pressure of 0.953
torr at 25 C. What is the molar mass of lysozyme?
4
Objective 4: Distributed Practice
a. The Ideal Gas Equation (PV = nRT) with Stoichiometry
Solid calcium hydride reacts with water to form hydrogen gas and aqueous calcium
hydroxide. This reaction is sometimes used to inflate life rafts, weather balloons, and the
like, where a simple, compact means of generating hydrogen gas is desired.
i. Write the balanced equation, including adjectives
ii. How many grams of calcium hydride are needed to generate 53.3 L
of hydrogen gas if the pressure of hydrogen is 814 torr at 21 C?
b. Hess’s Law
Given the following reactions
N2(g) + I2(g) 2NO(g)
2NO(g) + I2(g) 2NO2(g)
∆H = + 180.7 kJ
∆H = - 113.1 kJ
Calculate the enthalpy of reaction for
4NO(g) 2NO2(g) + N2(g)
c. Solution Stoichiometry
What is the molarity of a sodium hydroxide solution if 28.2 mL of a
0.355 M sulfuric acid solution is required to neutralize a 25.0 mL sample
of the sodium hydroxide solution?
5