Question 1

What volume of concentrated (14.7 M)  phosphoric acid is needed to prepare 25.0 L of 3.0 M H3PO4?

Accepted Answer

A)  0.20 L
B)  0.57 L
C)  1.8 L
D)  3.6 L
E)  5.1 LF) B) and C)
G) A) and E)

Question 2

Raoult's Law relates the vapor pressure of the solvent above the solution to its mole fraction in the solution. Which of the following is an accurate statement?

Accepted Answer

A)  Raoult's Law applies exactly to all solutions.
B)  Raoult's Law works best when applied to concentrated solutions.
C)  Raoult's Law works best when applied to dilute solutions.
D)  Raoult's Law applies only to non-ideal solutions.
E)  None of these choices are correct.F) B) and C)
G) D) and E)

Question 3

A 0.100 m MgSO4 solution has a freezing point of −0.23°C. What is the van't Hoff factor for this solution? Kf = 1.86°C/m

Accepted Answer

A)  0.62
B)  1.0
C)  1.2
D)  2.0
E)  4.0F) B) and D)
G) B) and E)

Question 4

The mole fraction of potassium nitrate in an aqueous solution is 0.0194. The solution's density is 1.0627 g/mL. Calculate the molarity of the solution.

Accepted Answer

A)  0.0194 M
B)  0.981 M
C)  1.05 M
D)  1.96 M
E)  19.4 MF) C) and E)
G) B) and D)

Question 5

Aqueous ammonia is commercially available in a solution that is 28% (w/w)  ammonia. What is the mole fraction of ammonia in such a solution?

Accepted Answer

A)  0.017
B)  0.023
C)  0.012
D)  0.24
E)  0.29F) A) and E)
G) A) and D)

Question 6

Sodium hydroxide is a common ingredient in drain cleaners such as Drano. The mole fraction of sodium hydroxide in a saturated aqueous solution is 0.310. What is the molality of the solution?

Accepted Answer

A)  0.310 m
B)  0.690 m
C)  1.24 m
D)  12.4 m
E)  25.0 mF) A) and E)
G) D) and E)

Question 7

Potassium fluoride is used for frosting glass. Calculate the molarity of a solution prepared by dissolving 78.6 g of KF in enough water to produce 225 mL of solution.

Accepted Answer

A)  0.304 M
B)  0.349 M
C)  1.35 M
D)  3.29 M
E)  6.01 MF) A) and D)
G) A) and C)

Question 8

Ideal solutions do not conform to Raoult's Law.

Accepted Answer

A) True 
 B)False

Question 9

Which of the following aqueous solutions will have the lowest osmotic pressure?

Accepted Answer

A)  0.10 m KOH
B)  0.10 m RbCl
C)  0.05 m CaSO 4
D)  0.05 m BaCl 2
E)  0.10 m K 2SO 4F) D) and E)
G) A) and E)

Question 10

Under physiological conditions, amino acids in solution carry

Accepted Answer

A)  no electrical charges.
B)  a net positive charge, due to an −NH 3 + group or groups.
C)  a net negative charge, due to a −COO − group or groups.
D)  both −NH 2 and −COOH groups.
E)  both −NH 3 + and −COO − groups.F) A) and C)
G) C) and D)

Question 11

From the following list of aqueous solutions and water, select the one with the lowest freezing point.

Accepted Answer

A)  0.75 m (NH 4) 3PO 4
B)  1.0 m CaSO 4
C)  1.0 m LiClO 4
D)  1.5 m CH 3OH, methyl alcohol
E)  pure waterF) B) and E)
G) D) and E)

Question 12

The Tyndall effect

Accepted Answer

A)  is observed in concentrated solutions.
B)  is observed only in dilute solutions.
C)  is observed in colloidal dispersions.
D)  is caused by Brownian motion.
E)  is used to determine the osmotic pressure of solutions.F) A) and B)
G) None of the above

Question 13

The concentration of iodine in sea water is 60. parts per billion by mass. If one assumes that the iodine exists in the form of iodide anions, what is the molarity of iodide in sea water? (The density of sea water is 1.025 g/mL.)

Accepted Answer

A)  4.8 × 10 −13 M
B)  4.8 × 10 −10 M
C)  4.8 × 10 −7 M
D)  4.7 × 10 −4 M
E)  4.7 × 10 −1 MF) A) and D)
G) A) and C)

Question 14

Which of the following ions will be expected to have the most negative heat of hydration, ΔHhydr?

Accepted Answer

A)  Na +
B)  Cs +
C)  Ca 2+
D)  F −
E)  I −F) A) and C)
G) A) and B)

Question 15

How many moles of bromide ions are present in 750.0 mL of 1.35 M MgBr2?

Accepted Answer

A)  0.506 mol
B)  1.01 mol
C)  2.03 mol
D)  3.04 mol
E)  None of these choices are correct.F) A) and B)
G) B) and E)

Question 16

Two aqueous are prepared: 1.00 m Na2CO3 and 1.00 m LiCl. Which of the following statements is true?

Accepted Answer

A)  The Na 2CO 3 solution has a higher osmotic pressure and higher vapor pressure than the LiCl solution.
B)  The Na 2CO 3 solution has a higher osmotic pressure and higher boiling point than the LiCl solution.
C)  The Na 2CO 3 solution has a lower osmotic pressure and lower vapor pressure than the LiCI solution.
D)  The Na 2CO 3 solution has a lower osmotic pressure and higher boiling point than the LiCl solution.
E)  None of these choices are correct.F) C) and E)
G) All of the above

Question 17

Hexachlorophene is used as a disinfectant in germicidal soaps. What mass of hexachlorophene (ℳ = 406.9 g/mol)  must be added to 125 g of chloroform to give a solution with a boiling point of 62.60°C? Kb = 3.63°C/m, boiling point of pure chloroform = 61.70°C

Accepted Answer

A)  12.6 g
B)  17.2 g
C)  31.0 g
D)  34.4 g
E)  101 gF) A) and C)
G) A) and B)

Question 18

Barbiturates are synthetic drugs used as sedatives and hypnotics. Barbital (ℳ = 184.2 g/mol)  is one of the simplest of these drugs. What is the boiling point of a solution prepared by dissolving 42.5 g of barbital in 825 g of acetic acid? Kb = 3.07°C/m; boiling point of pure acetic acid = 117.9°C

Accepted Answer

A)  117.0°C
B)  117.7°C
C)  118.1°C
D)  118.8°C
E)  >120°CF) A) and E)
G) B) and E)

Question 19

If a solute dissolves in an endothermic process

Accepted Answer

A)  H bonds must exist between solvent and solute.
B)  strong ion-dipole forces must exist in the solution.
C)  the solute must be a gas.
D)  the entropy of the solution is immaterial.
E)  the entropy of the solution must be greater than that of its pure components.F) B) and C)
G) A) and E)

Question 20

The solubility of the oxidizing agent potassium permanganate is 7.1 g per 100.0 g of water at 25°C. What is the mole fraction of potassium permanganate in this solution?

Accepted Answer

A)  0.0080
B)  0.0086
C)  0.066
D)  0.45
E)  0.48F) All of the above
G) B) and C)

Exam 13: The Properties of Mixtures: Solutions and Colloids

What volume of concentrated (14.7 M) phosphoric acid is needed to prepare 25.0 L of 3.0 M H₃PO₄?

Correct Answer
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The Tyndall effect

Correct Answer
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Raoult's Law relates the vapor pressure of the solvent above the solution to its mole fraction in the solution. Which of the following is an accurate statement?

Correct Answer
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A 0.100 m MgSO₄ solution has a freezing point of −0.23°C. What is the van't Hoff factor for this solution? K_f = 1.86°C/m

Correct Answer
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Under physiological conditions, amino acids in solution carry

Correct Answer
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Ideal solutions do not conform to Raoult's Law.

Correct Answer
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From the following list of aqueous solutions and water, select the one with the lowest freezing point.

Correct Answer
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The solubility of the oxidizing agent potassium permanganate is 7.1 g per 100.0 g of water at 25°C. What is the mole fraction of potassium permanganate in this solution?

Correct Answer
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Two aqueous are prepared: 1.00 m Na₂CO₃ and 1.00 m LiCl. Which of the following statements is true?

Correct Answer
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If a solute dissolves in an endothermic process

Correct Answer
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The concentration of iodine in sea water is 60. parts per billion by mass. If one assumes that the iodine exists in the form of iodide anions, what is the molarity of iodide in sea water? (The density of sea water is 1.025 g/mL.)

Correct Answer
verified

Hexachlorophene is used as a disinfectant in germicidal soaps. What mass of hexachlorophene (ℳ = 406.9 g/mol) must be added to 125 g of chloroform to give a solution with a boiling point of 62.60°C? K_b = 3.63°C/m, boiling point of pure chloroform = 61.70°C

Correct Answer
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Which of the following aqueous solutions will have the lowest osmotic pressure?

Correct Answer
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Aqueous ammonia is commercially available in a solution that is 28% (w/w) ammonia. What is the mole fraction of ammonia in such a solution?

Correct Answer
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Correct Answer
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How many moles of bromide ions are present in 750.0 mL of 1.35 M MgBr₂?

Correct Answer
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Which of the following ions will be expected to have the most negative heat of hydration, ΔH_hydr?

Correct Answer
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The mole fraction of potassium nitrate in an aqueous solution is 0.0194. The solution's density is 1.0627 g/mL. Calculate the molarity of the solution.

Correct Answer
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Potassium fluoride is used for frosting glass. Calculate the molarity of a solution prepared by dissolving 78.6 g of KF in enough water to produce 225 mL of solution.

Correct Answer
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Sodium hydroxide is a common ingredient in drain cleaners such as Drano. The mole fraction of sodium hydroxide in a saturated aqueous solution is 0.310. What is the molality of the solution?

Correct Answer
verified

Exam 13: The Properties of Mixtures: Solutions and Colloids

What volume of concentrated (14.7 M) phosphoric acid is needed to prepare 25.0 L of 3.0 M H3PO4?

Correct AnswerverifiedShow Answer

The Tyndall effect

Correct AnswerverifiedShow Answer

Raoult's Law relates the vapor pressure of the solvent above the solution to its mole fraction in the solution. Which of the following is an accurate statement?

Correct AnswerverifiedShow Answer

A 0.100 m MgSO4 solution has a freezing point of −0.23°C. What is the van't Hoff factor for this solution? Kf = 1.86°C/m

Correct AnswerverifiedShow Answer

Under physiological conditions, amino acids in solution carry

Correct AnswerverifiedShow Answer

Ideal solutions do not conform to Raoult's Law.

Correct AnswerverifiedShow Answer

From the following list of aqueous solutions and water, select the one with the lowest freezing point.

Correct AnswerverifiedShow Answer

The solubility of the oxidizing agent potassium permanganate is 7.1 g per 100.0 g of water at 25°C. What is the mole fraction of potassium permanganate in this solution?

Correct AnswerverifiedShow Answer

Two aqueous are prepared: 1.00 m Na2CO3 and 1.00 m LiCl. Which of the following statements is true?

Correct AnswerverifiedShow Answer

If a solute dissolves in an endothermic process

Correct AnswerverifiedShow Answer

The concentration of iodine in sea water is 60. parts per billion by mass. If one assumes that the iodine exists in the form of iodide anions, what is the molarity of iodide in sea water? (The density of sea water is 1.025 g/mL.)

Correct AnswerverifiedShow Answer

Hexachlorophene is used as a disinfectant in germicidal soaps. What mass of hexachlorophene (ℳ = 406.9 g/mol) must be added to 125 g of chloroform to give a solution with a boiling point of 62.60°C? Kb = 3.63°C/m, boiling point of pure chloroform = 61.70°C

Correct AnswerverifiedShow Answer

Which of the following aqueous solutions will have the lowest osmotic pressure?

Correct AnswerverifiedShow Answer

Aqueous ammonia is commercially available in a solution that is 28% (w/w) ammonia. What is the mole fraction of ammonia in such a solution?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

How many moles of bromide ions are present in 750.0 mL of 1.35 M MgBr2?

Correct AnswerverifiedShow Answer

Which of the following ions will be expected to have the most negative heat of hydration, ΔHhydr?

Correct AnswerverifiedShow Answer

The mole fraction of potassium nitrate in an aqueous solution is 0.0194. The solution's density is 1.0627 g/mL. Calculate the molarity of the solution.

Correct AnswerverifiedShow Answer

Potassium fluoride is used for frosting glass. Calculate the molarity of a solution prepared by dissolving 78.6 g of KF in enough water to produce 225 mL of solution.

Correct AnswerverifiedShow Answer

Sodium hydroxide is a common ingredient in drain cleaners such as Drano. The mole fraction of sodium hydroxide in a saturated aqueous solution is 0.310. What is the molality of the solution?

Correct AnswerverifiedShow Answer

What volume of concentrated (14.7 M) phosphoric acid is needed to prepare 25.0 L of 3.0 M H₃PO₄?

Correct Answer
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Correct Answer
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Correct Answer
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A 0.100 m MgSO₄ solution has a freezing point of −0.23°C. What is the van't Hoff factor for this solution? K_f = 1.86°C/m

Correct Answer
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Correct Answer
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Correct Answer
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Two aqueous are prepared: 1.00 m Na₂CO₃ and 1.00 m LiCl. Which of the following statements is true?

Correct Answer
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Correct Answer
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Correct Answer
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Hexachlorophene is used as a disinfectant in germicidal soaps. What mass of hexachlorophene (ℳ = 406.9 g/mol) must be added to 125 g of chloroform to give a solution with a boiling point of 62.60°C? K_b = 3.63°C/m, boiling point of pure chloroform = 61.70°C

Correct Answer
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Correct Answer
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Correct Answer
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How many moles of bromide ions are present in 750.0 mL of 1.35 M MgBr₂?

Correct Answer
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Which of the following ions will be expected to have the most negative heat of hydration, ΔH_hydr?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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