Calculating Drug Concentrations: Master Medication Solution Concentrations

Question 1

To prepare 100 mL of a 2% w/v sodium chloride solution, how many grams of sodium chloride should be weighed out?

Accepted Answer

2 grams

Answer

1 gram

Answer

0.5 grams

Answer

4 grams

Question 2

A patient needs 1000 units of heparin intravenously. The available vial contains 10,000 units/mL. How many mL should be administered?

Accepted Answer

0.1 mL

Answer

10 mL

Answer

0.01 mL

Answer

1 mL

Question 3

Which of these units is most commonly used to express drug concentration in pharmacy?

Accepted Answer

mg/mL

Answer

ppm

Answer

g/L

Answer

mol/L

Question 4

A pharmacist needs to prepare 500 mL of a 0.9% w/v sodium chloride solution. How many grams of sodium chloride are needed?

Accepted Answer

4.5 grams

Answer

45 grams

Answer

9 grams

Answer

0.9 grams

Question 5

What is the concentration (w/v) of a solution prepared by dissolving 5 g of sodium bicarbonate in 100 mL of water?

Accepted Answer

5% w/v

Answer

10% w/v

Answer

2.5% w/v

Answer

1% w/v

Question 6

A 500 mL bottle contains a 10% w/v dextrose solution. What is the total weight of dextrose in the bottle?

Accepted Answer

50 grams

Answer

5 grams

Answer

10 grams

Answer

100 grams

Question 7

A pharmacy technician needs to dilute 50 mL of a 10% w/v solution to achieve a final concentration of 5%. What is the final volume of the diluted solution?

Accepted Answer

100 mL

Answer

25 mL

Answer

50 mL

Question 8

You are asked to prepare 100 mL of a 0.5% w/v solution from a 10% w/v stock solution. What volume of the stock solution will you need?

Accepted Answer

5 mL

Answer

10 mL

Answer

20 mL

Answer

50 mL

Question 9

A 100 mL solution contains 5 grams of sodium chloride. What is the concentration of the solution expressed as a percentage weight-by-volume (w/v)?

Accepted Answer

5% w/v

Answer

10% w/v

Answer

20% w/v

Answer

0.5% w/v

Question 10

A pharmacist needs to prepare 100 mL of a 2% w/v sodium chloride solution. How many grams of sodium chloride are required?

Accepted Answer

2 grams

Answer

4 grams

Answer

1 gram

Question 11

A 100 mL bottle contains a 5% w/v dextrose solution. How many milligrams of dextrose are present in the bottle?

Accepted Answer

5000 mg

Answer

50,000 mg

Answer

50 mg

Answer

500 mg

Question 12

You need to dilute a 10% w/v stock solution of potassium chloride to make 250 mL of a 2% w/v solution. What volume of the stock solution is required?

Accepted Answer

50 mL

Answer

25 mL

Answer

100 mL

Answer

125 mL

Question 13

A patient requires 500 mg of amoxicillin. The pharmacy has a 250 mg/5 mL suspension. How many milliliters of the suspension should be administered?

Accepted Answer

10 mL

Answer

25 mL

Answer

20 mL

Answer

5 mL

Question 14

A pharmacist has 500 mL of a 1:100 w/v solution of benzalkonium chloride. What is the percentage concentration of benzalkonium chloride in this solution?

Accepted Answer

1%

Answer

0.1%

Answer

10%

Question 15

A patient requires 15 mg of a drug per kilogram of body weight (mg/kg). The patient weighs 70 kg. How many milligrams of the drug should be administered?

Accepted Answer

1050 mg

Answer

700 mg

Answer

150 mg

Answer

70 mg

Question 16

A 50 mL vial contains a solution with 250 mg of a drug. What is the concentration of the drug in mg/mL?

Accepted Answer

5 mg/mL

Answer

12.5 mg/mL

Answer

25 mg/mL

Answer

10 mg/mL

Question 17

A pharmacist needs to prepare 250 mL of a 0.5% w/v solution of sodium bicarbonate. How many grams of sodium bicarbonate are required?

Accepted Answer

1.25 grams

Answer

0.5 grams

Answer

12.5 grams

Answer

2.5 grams

Question 18

A patient needs to receive 250 mL of intravenous fluids over 4 hours. What is the flow rate in milliliters per minute?

Accepted Answer

10.4 mL/min

Answer

62.5 mL/min

Answer

5 mL/min

Question 19

A doctor orders 1000 mL of 0.9% w/v sodium chloride solution to be infused over 8 hours. What is the flow rate in mL/hour?

Accepted Answer

125 mL/hour

Answer

1000 mL/hour

Answer

250 mL/hour

Answer

500 mL/hour

Question 20

A patient is prescribed 500 mg of medication per day. If the medication is available in a solution of 25 mg/mL, what volume (in mL) should be administered?

Accepted Answer

20

Answer

10

Answer

50

Answer

25

Question 21

A stock solution of a drug has a concentration of 100 mg/mL. To prepare 250 mL of a 25 mg/mL solution, how much (in mL) of the stock solution should be used?

Accepted Answer

62.5

Answer

50

Answer

125

Answer

250

Question 22

Which of the following units of concentration is equivalent to 1000 mg/L?

Accepted Answer

1 mg/mL

Answer

10 mg/mL

Answer

100 mg/mL

Answer

0.1 mg/L

Question 23

A pharmacist needs to prepare 500 mL of a 0.9% saline solution. If the available saline solution is 5%, what volume (in mL) of the 5% solution should be used?

Accepted Answer

90

Answer

250

Answer

50

Answer

180

Question 24

Which of the following formulas can be used to calculate drug concentration?

Accepted Answer

Concentration = (Amount of Drug) / (Volume of Solution)

Answer

Concentration = (Amount of Drug) * (Volume of Solution)

Answer

Concentration = (Volume of Solution) / (Amount of Drug)

Question 25

A patient's blood test shows a potassium level of 4 mEq/L. How many milligrams of potassium are present in 100 mL of the patient's blood?

Accepted Answer

39

Answer

23

Answer

156

Answer

78

Question 26

Which of the following is NOT a factor that affects the concentration of a solution?

Accepted Answer

Temperature

Answer

Amount of solute

Answer

Volume of solution

Question 27

A pharmacist is preparing a solution that requires a concentration of 50 mg/mL. If the pharmacist has 1 g of the drug, what volume (in mL) of solution can be prepared?

Accepted Answer

20

Answer

10

Answer

100

Answer

50

Question 28

Which of the following represents a diluted solution?

Accepted Answer

10 mg/mL

Answer

200 mg/mL

Answer

100 mg/mL

Answer

50 mg/mL

Question 29

A patient is prescribed a medication in capsule form. Each capsule contains 250 mg of the medication. If the patient needs to take 750 mg of the medication twice a day, how many capsules should be taken per dose?

Accepted Answer

3

Answer

4

Answer

1

Answer

2

Question 30

A patient requires 500 mg of a drug in 250 mL of solution. The available drug concentration is 20 mg/mL. What volume of the drug solution should be used?

Accepted Answer

12.5 mL

Answer

25 mL

Answer

50 mL

Answer

6.25 mL

Question 31

A pharmacy has 100 mL of a 5% dextrose solution. How many grams of dextrose are present in the solution?

Accepted Answer

5 grams

Answer

50 grams

Answer

0.5 grams

Answer

10 grams

Question 32

A nurse needs to prepare 500 mL of a 0.9% saline solution. How many grams of sodium chloride (NaCl) are needed?

Accepted Answer

4.5 grams

Answer

0.45 grams

Answer

18 grams

Answer

9 grams

Question 33

A doctor prescribes an intramuscular injection of 250 mg of a drug in 1 mL of solution. The available drug concentration is 50 mg/mL. What volume of the drug solution should be drawn up?

Accepted Answer

5 mL

Answer

1 mL

Answer

2 mL

Answer

10 mL

Question 34

A patient is prescribed 1 gram of medication per day. The medication is available in 250 mg tablets. How many tablets should the patient take each day?

Accepted Answer

4

Answer

8

Answer

1

Answer

2

Question 35

A hospital needs to prepare 5 liters of a 10% glucose solution. How many grams of glucose are required?

Accepted Answer

500 grams

Answer

50 grams

Answer

100 grams

Answer

10 grams

Question 36

A laboratory has a 1 M solution of hydrochloric acid (HCl). What is the molarity of the solution after it is diluted to 500 mL with water?

Accepted Answer

0.2 M

Answer

2 M

Answer

0.5 M

Answer

1 M

Question 37

A chemical reaction produces 25 mL of a 0.5 M solution of sodium hydroxide (NaOH). How many moles of NaOH are present in this solution?

Accepted Answer

0.0125 moles

Answer

0.025 moles

Answer

0.05 moles

Question 38

A patient is given an intravenous (IV) drip of 1 liter of a 5% dextrose solution. How many grams of dextrose will the patient receive?

Accepted Answer

50 grams

Answer

100 grams

Answer

500 grams

Answer

10 grams

Question 39

A pharmacy has a 10% ointment and needs to prepare a 5% ointment. How many grams of the 10% ointment should be mixed with 100 grams of the base ointment to achieve the desired concentration?

Accepted Answer

50 grams

Answer

100 grams

Answer

75 grams

Answer

25 grams