Question 1

85.0 grams of potassium bromide are to be used to produce a 0.300 M solution. What will be the total volume of this solution?

Accepted Answer

A)  2.38 L 
B)  2.83 L 
C)  283 L 
D)  0.214 L 
E)  0.420 L

Question 2

Which of the following pairs of liquids would form a nonideal solution?

Accepted Answer

A)  CHCl3 and (CH3)2CO 
B)  C6H5-CH3 (toluene) and C6H6 (benzene) 
C)  CH3CH2CH2OH and CH3CH(OH)CH3 
D)  H5C6-C6H5 (diphenyl) and C6H6 (benzene)

Question 3

What is the osmotic pressure in mmHg of 2.00 L of a 1.34 × 10-3 M solution at 25°C if four moles of ions are produced in aqueous solution for every mole of solute dissolved?

Accepted Answer

A)  62.3 mmHg 
B)  1.99 × 103 mmHg 
C)  99.6 mmHg 
D)  1.31 mmHg 
E)  9.96 × 103 mmHg

Question 4

Given that the vapor pressure of pure n-hexane and pure n-heptane at 25°C are 151.4 mmHg and 45.62 mmHg respectively, calculate the total vapor pressure above a solution containing only n-hexane and n-heptane in which the mole fraction of n-hexane is 0.600.

Accepted Answer

A)  87.9 mmHg 
B)  197 mmHg 
C)  106 mmHg 
D)  109 mmHg 
E)  170 mmHg

Question 5

A solid solution of zinc in copper is an example of:

Accepted Answer

A)  a solvent 
B)  a solute 
C)  the U.S. five-cent nickel 
D)  a non-uniform solute 
E)  an alloy

Question 6

The solubility of CO in water at 0°C and 1 atm CO pressure is 0.0354 mg of CO in 1 mL of water. Calculate the molarity of aqueous CO solution at the normal partial pressure of CO of 0.00036 atm?

Accepted Answer

A)  4.5 × 10-7 M 
B)  1.6 × 10-3 M 
C)  1.3 × 10-5 M 
D)  2.9 × 10-4 M 
E)  3.2 × 10-3 M

Question 7

A 1.00 molal solution of NaCl in water contains:

Accepted Answer

A)  1.00 g NaCl per 1000.0 g H2O 
B)  1.00 mol NaCl per 1000.0 g H2O 
C)  1.00 mol NaCl per 1000.0 kg H2O 
D)  1000.0 g NaCl per 1000.0 g H2O 
E)  1.00 mol NaCl per 1000.0 mol H2O

Question 8

Which of the following material-colloid type combinations is INCORRECT?

Accepted Answer

A)  mayonnaise - emulsion 
B)  whipped cream - foam 
C)  smoke - aerosol 
D)  lava - solid foam 
E)  opal - solid sol

Question 9

Which of the following is an example of a colloid?

Accepted Answer

A)  sucrose in water 
B)  whipped cream 
C)  steel 
D)  salt in water

Question 10

Most volatile liquids can be separated from each other by fractional distillation.

Accepted Answer

A) True 
 B)False

Question 11

Which of the following aqueous solutions has the lowest freezing point?

Accepted Answer

A)  1.5 m aluminum perchlorate. 
B)  1.0 m magnesium phosphate 
C)  1.5 m calcium nitrate 
D)  2.0 m potassium chloride

Question 12

An aqueous solution containing 1.0 g ephedrine in 20.0 mL solution is said to be:

Accepted Answer

A)  5.0% ephedrine (mass/vol) 
B)  1.0% ephedrine (mass/vol) 
C)  0.50% ephedrine (mass/vol) 
D)  0.050% ephedrine (mass/vol) 
E)  20.0% ephedrine (mass/vol)

Question 13

A mixture of benzene and toluene has a total vapor pressure at 25°C of 45.06 mmHg. What is the partial pressure of benzene in this solution? The vapor pressure of pure benzene and pure toluene at 25°C are 95.03 mmHg and 28.40 mmHg respectively.

Accepted Answer

A)  0.7500 mmHg 
B)  23.76 mmHg 
C)  0.3217 mmHg 
D)  21.30 mmHg 
E)  16.66 mmHg

Question 14

What mass in grams of a molecular substance (molar mass = 50.0 g/mol) must be added to 500 g of water to produce a solution that boils at 101.56°C? [Kb(water) = 0.512°C m-1]

Accepted Answer

A)  76.2 g 
B)  150.0 g 
C)  100.0 g 
D)  30.0 g 
E)  152.4 g

Question 15

Choose the INCORRECT statement.

Accepted Answer

A)  Since colloidal particles are large aggregates of atoms they are electrically neutral. 
B)  Colloidal suspensions can be prepared in which the particles do not settle. 
C)  The addition of electrolytes to a colloidal suspension will sometimes cause the particles to coalesce and precipitate. 
D)  Colloidal particles reflect light from a beam. 
E)  Colloidal suspensions exhibit the Tyndall Effect.

Question 16

An unsaturated solution will have some solid undissolved in the bottom of the container.

Accepted Answer

A) True 
 B)False

Question 17

A solution of nonvolatile solute has an osmotic pressure of 141 mmHg at 25°C. What is the molarity of the solution?

Accepted Answer

A)  0.00759 M 
B)  5.76 M 
C)  0.0904 M 
D)  0.0339 M 
E)  0.174 M

Question 18

Which of the following aqueous solutions has the highest boiling point?

Accepted Answer

A)  1.0 m magnesium phosphate 
B)  1.5 m sodium sulfate 
C)  2.0 m lithium perchlorate 
D)  1.5 m magnesium sulfate

Question 19

An aqueous solution containing 12.0% MgCl2 by mass has a density of 1.105 g/mL. What is the mol fraction of water in this solution?

Accepted Answer

A)  0.975 
B)  0.880 
C)  0.868 
D)  0.133 
E)  0.952

Question 20

For the formation of an ideal solution from two liquid hydrocarbons, ΔHsoln < 0.

Accepted Answer

A) True 
 B)False

Exam 13: Solutions and Their Physical Properties

85.0 grams of potassium bromide are to be used to produce a 0.300 M solution. What will be the total volume of this solution?

Which of the following pairs of liquids would form a nonideal solution?

What is the osmotic pressure in mmHg of 2.00 L of a 1.34 × 10^-3 M solution at 25°C if four moles of ions are produced in aqueous solution for every mole of solute dissolved?

Given that the vapor pressure of pure n-hexane and pure n-heptane at 25°C are 151.4 mmHg and 45.62 mmHg respectively, calculate the total vapor pressure above a solution containing only n-hexane and n-heptane in which the mole fraction of n-hexane is 0.600.

A solid solution of zinc in copper is an example of:

The solubility of CO in water at 0°C and 1 atm CO pressure is 0.0354 mg of CO in 1 mL of water. Calculate the molarity of aqueous CO solution at the normal partial pressure of CO of 0.00036 atm?

A 1.00 molal solution of NaCl in water contains:

Which of the following material-colloid type combinations is INCORRECT?

Which of the following is an example of a colloid?

Most volatile liquids can be separated from each other by fractional distillation.

Which of the following aqueous solutions has the lowest freezing point?

An aqueous solution containing 1.0 g ephedrine in 20.0 mL solution is said to be:

A mixture of benzene and toluene has a total vapor pressure at 25°C of 45.06 mmHg. What is the partial pressure of benzene in this solution? The vapor pressure of pure benzene and pure toluene at 25°C are 95.03 mmHg and 28.40 mmHg respectively.

What mass in grams of a molecular substance (molar mass = 50.0 g/mol) must be added to 500 g of water to produce a solution that boils at 101.56°C? [Kb(water) = 0.512°C m-1]

Choose the INCORRECT statement.

An unsaturated solution will have some solid undissolved in the bottom of the container.

A solution of nonvolatile solute has an osmotic pressure of 141 mmHg at 25°C. What is the molarity of the solution?

Which of the following aqueous solutions has the highest boiling point?

An aqueous solution containing 12.0% MgCl₂ by mass has a density of 1.105 g/mL. What is the mol fraction of water in this solution?

For the formation of an ideal solution from two liquid hydrocarbons, ΔHsoln < 0.