Question 1

A laboratory technician prepares a solution by dissolving 10.0 g of NaCl in enough water to make 200.0 mL of solution. What is the mass/volume percent concentration ($\frac{m}{v}\%$) of NaCl in this solution?

Accepted Answer

$5.0\%$

Question 2

A nurse needs to prepare 500.0 mL of a 0.9\% (m/v) saline solution for intravenous use. How many grams of NaCl are required?

Accepted Answer

$4.5\ \mathrm{g}$

Question 3

A 750.0 mL bottle of mouthwash contains 150.0 mL of ethanol. What is the (v/v) percent of ethanol in this solution?

Accepted Answer

$20.0\%$

Question 4

Which of the following best describes the difference between mass/volume percent and volume/volume percent concentration?

Accepted Answer

Mass/volume percent uses grams of solute per 100 mL of solution, while volume/volume percent uses mL of solute per 100 mL of solution.

Question 5

A solution is prepared by dissolving 13.5 g of KNO$_3$ in enough water to make 85.0 mL of solution. What is the (m/v) percent of KNO$_3$ in this solution?

Accepted Answer

$15.9\%$

Question 6

A bottle of wine contains 11.0\% (v/v) ethanol and has a total volume of 750.0 mL. How many mL of ethanol are present in the bottle?

Accepted Answer

$82.5\ \mathrm{mL}$

Question 7

Calculate the grams of KOH needed to prepare 450.0 mL of a 2.0\% (m/v) KOH solution.

Accepted Answer

$9.0\ \mathrm{g}$

Question 8

What is the mass/volume percent concentration of a solution containing 0.075 mol sucrose (C$_{12}$H$_{22}$O$_{11}$, molar mass = 342 g/mol) in 270 mL of solution?

Accepted Answer

$6.7\%$

Question 9

A pediatric ibuprofen suspension contains 100 mg/5 mL. How many milligrams of ibuprofen are in a 2.7 tsp dose? (1 tsp = 5 mL)

Accepted Answer

$2.7 	imes 10^2\ \mathrm{mg}$

Question 10

A pharmacist needs to prepare 250 mL of a 4.0\% (m/v) glucose solution. How many grams of glucose are required?

Accepted Answer

$10.0\ \mathrm{g}$

Question 11

A solution is labeled as 12.0\% (v/v) isopropanol. If you have 500 mL of this solution, how many mL of isopropanol are present?

Accepted Answer

$60\ \mathrm{mL}$

Question 12

Which of the following statements about solution concentration is correct?

Accepted Answer

A 10\% (m/v) solution contains 10 g of solute in 100 mL of solution.

Question 13

A 100 mL sample of a disinfectant contains 30 mL of ethanol. What is the (v/v) percent of ethanol in the disinfectant?

Accepted Answer

$30\%$

Question 14

If a solution is labeled as 5.0\% (m/v) NaCl, how many grams of NaCl are present in 250 mL of this solution?

Accepted Answer

$12.5\ \mathrm{g}$

Question 15

A 2.0\% (m/v) KCl solution is required for a medical procedure. If you have only 1.0 g of KCl, what is the maximum volume of solution (in mL) you can prepare?

Accepted Answer

$50\ \mathrm{mL}$

Question 16

A solution is made by dissolving 2.5 g of a drug in enough water to make 50.0 mL of solution. What is the (m/v) percent concentration?

Accepted Answer

$5.0\%$

Question 17

A 1000 mL bottle of a cleaning solution contains 80 mL of ammonia. What is the (v/v) percent of ammonia in the solution?

Accepted Answer

$8.0\%$

Question 18

A solution is prepared by mixing 25 mL of acetic acid with enough water to make 500 mL of solution. What is the (v/v) percent of acetic acid?

Accepted Answer

$5.0\%$

Question 19

A 250 mL sample of a sports drink contains 21 g of sugar. What is the (m/v) percent concentration of sugar in the drink?

Accepted Answer

$8.4\%$

Question 20

A 100 mL sample of a solution contains 0.5 g of solute. What is the (m/v) percent concentration?

Accepted Answer

$0.5\%$

Solution Concentration: Mass/Volume Percent and Volume Percent in GOB Chemistry

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