Unit 12: Solutions

Practice Test

Objective 1: Solution properties (p. 453 – 458)

Determine whether the statements about the observable properties of solutions are TRUE (T) or FALSE (F)

___ 1.Solutions are also known as homogeneous mixtures.

___ 2.Solutions can be filtered to collect the solute.

___ 3.A saturated solution is an example of a dynamic equilibrium process.

___ 4.If solid potassium chloride dissolved in water, water would be considered the solute.

Select the best choice.

___ 5.Which of the following is NOTan electrolyte?

A) Sodium chloride B) hydrogen chlorideC) sugarD) potassium chloride

___ 6.Oil dissolves in carbon tetrachloride. Oil would be considered:

A) Soluble B) miscibleC) immiscibleD) insoluble

___ 7.Sugar in water is an example of which solute-solvent combination?

A)gas-liquidB) liquid-liquid C) solid-liquidD) liquid solid

___ 8.Which of the following usually makes a substance dissolve faster in a solvent?

A)Agitating the solutionB) increasing the particle size C) Lowering the temperature

9. Explain the orientation of the water molecules around the sodium and chloride ions seen in the diagram above.

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Score box / □ A= 9/9 (100) / □ B= 8/9 (89) / □ NY

Objective 2: Solubility and Interpreting Solubility curves. (p. 457-459)

Directions: Using the solubility curve, answer the following questions.

  1. Which compound is least soluble in water at 50ºC? ______
  2. How many grams of KNO₃ can be dissolved in 100g H₂O at 60ºC? ______
  3. At 20ºC, 20 grams of KCl is added to 100 g of H2O water. Is the solution saturated, unsaturated, or supersaturated? ______
  4. At 80ºC, how much NH₃ can be dissolved in 200 g. H₂O? ______
  5. 90 g of NaNO3 is added to 100 g H2O at 0C. To what temperature must the solution be raised to in order to produce a saturated solution? ______
  6. If 100 grams of NH4Cl is added to 100 grams of water at 90ºC, how many grams will not dissolve? ______

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___7. All the KBr that will dissolve in a solution has dissolved and several undissolved crystals remain at the

bottom. The solution is:

A) SaturatedB) Unsaturated

C) SupersaturatedD) At the incorrect pressure t dissolve the solid

___ 8. How can you best increase the solubility of a gas in a liquid?

A)Increase both the temperature and pressure

B)Decrease both the temperature and pressure

C)Increase the temperature and decrease the pressure

D)Decrease the temperature and increase the pressure

___ 9. A substance that is not soluble in a polar solvent is

A) Nonpolar B) IonicC) PolarD) Hydrogen bonded

Score box / □A= 9/9 (100) / □B= 8/9 (89) / □NY

Objective 3: Determine the concentration of solutions using molarity and describe how to prepare molar solutions. (p. 464- 466)

Directions: Solve the following problems, including all WORK, FORMULAS, UNITS, and SIG FIGS. Place a BOX around your final answer.

1. What is the molarity of a solution of KOH if 1.30 liters of the solution contains 0.56 moles of KOH? (1)

2. You have a 3.5 L solution that contains 60.0 grams of KCl. What is the molarity of the solution? (2)

3. To what volume should 5.0 g Na2SO4 be diluted in order to prepare a .25M Na2SO4 solution?(2)

4. You want to make 400.0 mL of a KF solution with a concentration of 0.500 M. How many grams of

KF do you need?(3)

5. Describe in words how you would makethe solution found in problem 4.(1)

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Score box / □A= 3/3 (100) / □B= 2/3 (88) / □NY