$$\frac{6.022 \times 10$$^{23}$$\,\text{ions}}{1\,\text{mol}}$$

$$\text{Osmolarity} = \text{Molarity} \times n$$

Question 1

Which of the following best describes osmolarity?

Accepted Answer

Osmolarity is the number of ions per liter of solution.

Question 2

A 0.10 M solution of CaBr$$_2 is $$prepared. What is the osmolarity of this solution?

Accepted Answer

$$0.30\,	ext{osmoles/L}$$

Question 3

Which of the following solutions will have the highest concentration of bromide ions?

Accepted Answer

0.10 M CaBr$$_2$$

Question 4

What is the concentration of hydroxide ions in a 0.350 M solution of gallium hydroxide, Ga(OH)$$_3$$?

Accepted Answer

$$1.05\,	ext{M}$$

Question 5

How many moles of chloride ions are present in 500 mL of 1.0 M NaCl solution?

Accepted Answer

$$0.25\,	ext{mol}$$

Question 6

If you dissolve 58.1 g of AgCl in enough water to make 500 mL of solution, what is the molarity of chloride ions? (Molar mass of AgCl = 143.32 g/mol)

Accepted Answer

$$0.406\,	ext{M}$$

Question 7

How many milligrams of nitride ions are required to prepare 820 mL of 0.330 M Ba$$_3N$_2$$ solution? (Molar mass of N$$^{3-} = 14.01 g/$$mol)

Accepted Answer

270.6 mg

Question 8

How many bromide ions are present in 65.5 mL of 0.210 M GaBr$$_3$$ solution?

Accepted Answer

$$1.38 	imes 10$$^{22}$$ ions

Question 9

Which conversion factor would you use to determine the number of ions from molarity and volume?

Accepted Answer

$$\frac{6.022 	imes 10$$^{23}$$\,	ext{ions}}{1\,	ext{mol}}$$

Question 10

A patient receives an intravenous solution containing 0.150 M K$$_2SO$_4. $$What is the osmolarity of the solution?

Accepted Answer

$$0.450\,	ext{osmoles/L}$$

Question 11

Which of the following statements about osmolarity is correct?

Accepted Answer

Osmolarity depends on both the molarity and the number of ions produced per formula unit.

Question 12

A solution contains 0.250 M AlCl$$_3. $$What is the concentration of chloride ions?

Accepted Answer

$$0.750\,	ext{M}$$

Question 13

Which of the following compounds will produce the greatest number of ions per mole when dissolved in water?

Accepted Answer

AlBr$$_3$$

Question 14

If you have 0.120 L of 0.450 M CaCl$$_2$$ solution, how many moles of Ca$$^{2+}$$ ions are present?

Accepted Answer

$$0.0540\,	ext{mol}$$

Question 15

A nurse needs to prepare 500 mL of a solution containing 0.20 M Na$$_2SO$_4. $$How many moles of sodium ions are present in the solution?

Accepted Answer

Question 16

Which of the following is the correct formula to calculate osmolarity from molarity for a compound that dissociates into $$n$$ ions?

Accepted Answer

$$	ext{Osmolarity} = 	ext{Molarity} 	imes n$$

Osmolarity and Ion Calculations in Solution

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