Q: A solution is prepared by mixing 8.00 g of KCl with enough water to make 50.00 g of solution. What is the mass percent (m/m) of KCl in the solution?

$$\frac{8.00}{50.00} \times 100\% = 16.0\%$$

Q: Which of the following best describes mass/volume percent (m/v) concentration?

$$\frac{\text{g of solute}}{\text{mL of solution}} \times 100\%$$

Q: A patient receives 125 mL of a 20% (m/v) mannitol solution every hour. How many grams of mannitol are administered in 1 hour?

$$125 \text{ mL} \times \frac{20 \text{ g}}{100 \text{ mL}} = 25 \text{ g}$$

Q: How many milliliters of a 5.75% (v/v) ethanol solution can be prepared from 2.25 mL of ethanol?

$$2.25 \text{ mL} \times \frac{100 \text{ mL solution}}{5.75 \text{ mL ethanol}} = 39.1 \text{ mL solution}$$

Q: A 320-mL bottle of solution is labeled as a 7.5% bleach solution. How many mL of bleach are present in the solution?

$$320 \text{ mL} \times \frac{7.5 \text{ mL bleach}}{100 \text{ mL solution}} = 24 \text{ mL bleach}$$

Q: A patient needs 135 g of glucose in the next 12 hours. How many liters of a 5% (m/v) glucose solution must be given?

$$135 \text{ g} \times \frac{100 \text{ mL solution}}{5 \text{ g glucose}} \times \frac{1 \text{ L}}{1000 \text{ mL}} = 2.70 \text{ L solution}$$

Q: Which of the following is the correct formula for calculating mass percent (m/m) of a solute in a solution?

$$\frac{\text{g of solute}}{\text{g of solute} + \text{g of solvent}} \times 100\%$$

Q: If an ointment contains 0.1% (m/m) Mometasone Furoate, how many grams of ointment can be made from 0.050 g of Mometasone Furoate?

$$0.050 \text{ g} \times \frac{100 \text{ g ointment}}{0.1 \text{ g Mometasone Furoate}} = 50 \text{ g ointment}$$

Q: Which of the following is a correct conversion factor for a 4.8% (m/v) HCl solution?

$$\frac{4.8 \text{ g HCl}}{100 \text{ mL solution}}$$

Q: A solution is prepared by mixing 15.0 g of $$\text{Na}_2\text{CO}_3$$ and 235 g of $$\text{H}_2\text{O}. $$What is the mass percent (m/m) of $$\text{Na}_2\text{CO}_3 in $$the solution?

$$\frac{15.0}{15.0 + 235} \times 100\% = 6.00\%$$

Question 1

A solution is prepared by mixing 8.00 g of KCl with enough water to make 50.00 g of solution. What is the mass percent (m/m) of KCl in the solution?

Accepted Answer

$$\frac{8.00}{50.00} 	imes 100\% = 16.0\%$$

Question 2

Which of the following best describes mass/volume percent (m/v) concentration?

Accepted Answer

$$\frac{	ext{g of solute}}{	ext{mL of solution}} 	imes 100\%$$

Question 3

A patient receives 125 mL of a 20% (m/v) mannitol solution every hour. How many grams of mannitol are administered in 1 hour?

Accepted Answer

$$125 	ext{ mL} 	imes \frac{20 	ext{ g}}{100 	ext{ mL}} = 25 	ext{ g}$$

Question 4

How many milliliters of a 5.75% (v/v) ethanol solution can be prepared from 2.25 mL of ethanol?

Accepted Answer

$$2.25 	ext{ mL} 	imes \frac{100 	ext{ mL solution}}{5.75 	ext{ mL ethanol}} = 39.1 	ext{ mL solution}$$

Question 5

A 320-mL bottle of solution is labeled as a 7.5% bleach solution. How many mL of bleach are present in the solution?

Accepted Answer

$$320 	ext{ mL} 	imes \frac{7.5 	ext{ mL bleach}}{100 	ext{ mL solution}} = 24 	ext{ mL bleach}$$

Question 6

A patient needs 135 g of glucose in the next 12 hours. How many liters of a 5% (m/v) glucose solution must be given?

Accepted Answer

$$135 	ext{ g} 	imes \frac{100 	ext{ mL solution}}{5 	ext{ g glucose}} 	imes \frac{1 	ext{ L}}{1000 	ext{ mL}} = 2.70 	ext{ L solution}$$

Question 7

Which of the following is the correct formula for calculating mass percent (m/m) of a solute in a solution?

Accepted Answer

$$\frac{	ext{g of solute}}{	ext{g of solute} + 	ext{g of solvent}} 	imes 100\%$$

Question 8

If an ointment contains 0.1% (m/m) Mometasone Furoate, how many grams of ointment can be made from 0.050 g of Mometasone Furoate?

Accepted Answer

$$0.050 	ext{ g} 	imes \frac{100 	ext{ g ointment}}{0.1 	ext{ g Mometasone Furoate}} = 50 	ext{ g ointment}$$

Question 9

Which of the following is a correct conversion factor for a 4.8% (m/v) HCl solution?

Accepted Answer

$$\frac{4.8 	ext{ g HCl}}{100 	ext{ mL solution}}$$

Question 10

A solution is prepared by mixing 15.0 g of $$	ext{Na}_2	ext{CO}_3$$ and 235 g of $$	ext{H}_2	ext{O}. $$What is the mass percent (m/m) of $$	ext{Na}_2	ext{CO}_3 in $$the solution?

Accepted Answer

$$\frac{15.0}{15.0 + 235} 	imes 100\% = 6.00\%$$

Question 11

Which of the following statements about solution concentration units is correct?

Accepted Answer

Volume percent (v/v) is used when both solute and solution are liquids.

Question 12

A medication is labeled as 0.05% (m/m) Betamethasone Dipropionate ointment. How many grams of active ingredient are present in 200 g of ointment?

Accepted Answer

$$200 	ext{ g ointment} 	imes \frac{0.05 	ext{ g Betamethasone}}{100 	ext{ g ointment}} = 0.10 	ext{ g}$$

Question 13

Which of the following is the correct formula for calculating volume percent (v/v) of a solute in a solution?

Accepted Answer

$$\frac{	ext{mL of solute}}{	ext{mL of solution}} 	imes 100\%$$

Question 14

If you have 375 g of a 2.0% (m/m) NaCl solution, how many grams of NaCl are present?

Accepted Answer

$$375 	ext{ g solution} 	imes \frac{2.0 	ext{ g NaCl}}{100 	ext{ g solution}} = 7.5 	ext{ g NaCl}$$

Question 15

Which of the following is NOT a correct unit for expressing solution concentration?

Accepted Answer

Mass/volume percent (m/v)

Question 16

Which conversion factor would you use to determine the amount of solute in a given amount of solution for a 8.50% (m/m) NaOH solution?

Accepted Answer

$$\frac{8.50 	ext{ g NaOH}}{100 	ext{ g solution}}$$

Solutions and Solution Concentration: Mass, Volume, and Mass/Volume Percent

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