Question 1

Which of the following statements best describes a colligative property?

Accepted Answer

A property that depends only on the number of solute particles, not their identity.

Question 2

A solution is prepared by dissolving 0.10 mol of NaCl in 1.0 L of water. What is the van't Hoff factor ($$i) $$for NaCl in this solution?

Accepted Answer

$$i = 2$$

Question 3

Which compound will produce the greatest increase in boiling point when 0.10 mol is dissolved in 1.0 L of water?

Accepted Answer

CaCl$$_2$$

Question 4

What is the osmolarity of a 1.0 M solution of AlCl$$_3$$?

Accepted Answer

$$4.0~	ext{osm/L}$$

Question 5

A solution contains 0.10 M sucrose, 0.10 M NaCl, and 0.10 M CaCl$$_2. $$Which solution will have the highest osmotic pressure?

Accepted Answer

0.10 M CaCl$$_2$$

Question 6

Which of the following compounds will have the lowest freezing point when dissolved in water at the same molarity?

Accepted Answer

MgCl$$_2$$

Question 7

If 0.10 mol of Al$$_2(SO$_4$$)$$_3 is $$dissolved in 1.0 L of water, how many moles of ions are produced?

Accepted Answer

$$0.40~	ext{mol}$$

Question 8

Which of the following will have the highest vapor pressure at the same temperature?

Accepted Answer

0.10 M pure water

Question 9

Calculate the ionic molality of potassium ions in a 1.18 m solution of K$$_3PO$_4.$$

Accepted Answer

$$3.54~	ext{m}$$

Question 10

Which of the following compounds will have the largest van't Hoff factor ($$i$$)?

Accepted Answer

AlCl$$_3$$

Question 11

A solution of 0.10 M CaCl$$_2 is $$prepared. What is the total concentration of ions in the solution?

Accepted Answer

$$0.30~	ext{M}$$

Question 12

Which of the following will have the lowest boiling point?

Accepted Answer

0.10 M pure water

Question 13

If the van't Hoff factor ($$i) $$for Na$$_2SO$_4 is 3$$, what is the osmolarity of a 0.25 M Na$$_2SO$_4$$ solution?

Accepted Answer

$$0.75~	ext{osm/L}$$

Question 14

Which of the following best explains why the freezing point of a solution is lower than that of the pure solvent?

Accepted Answer

Solute particles disrupt the formation of the solid phase, requiring a lower temperature to freeze.

Question 15

A patient receives an intravenous solution containing 0.30 M K$$_2SO$_4. $$What is the total concentration of ions delivered?

Accepted Answer

$$0.90~	ext{M}$$

Question 16

Which of the following solutions will have the highest osmolarity?

Accepted Answer

0.10 M aluminum chloride

Question 17

Which of the following compounds, when dissolved in water, will produce the most particles per mole?

Accepted Answer

AlCl$$_3$$

Question 18

A solution of 0.10 M MgCl$$_2 is $$prepared. What is the van't Hoff factor ($$i) $$for MgCl$$_2$$?

Accepted Answer

$$i = 3$$

Question 19

Which of the following will have the highest vapor pressure?

Accepted Answer

0.45 M pure water

Question 20

A solution is made by dissolving 0.10 mol of K$$_2SO$_4 in 1.0 L of $$water. How many moles of ions are present in the solution?

Accepted Answer

$$0.30~	ext{mol}$$

Colligative Properties, Van't Hoff Factor, and Osmolarity/Osmolality in GOB Chemistry

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