1.Easy
Practice exercise (made-up values, not clinical guidance). How many g of sodium chloride are in 500 mL of 0.9% w/v solution? Find m.
0.9% w/v500 mL
m = g
Pharmacy calculations worksheet with answers
2.Easy
Practice exercise (made-up values, not clinical guidance). How many g of dextrose are in 250 mL of 5% w/v solution? Find m.
5% w/v250 mL
m = g
3.Medium
Practice exercise (made-up values, not clinical guidance). A vial of penicillin G contains 5 000 000 units. Its practice label gives three strengths (see the table). You add 18.2 mL of diluent. The prescribed dose is 400 000 units. What volume V do you draw up? Round to one decimal place.
18.2 mL → 250 000 units/mL400 000 units
V = mL
4.Medium
A solution has a ratio strength of 1:10 000. You need 0.76 mg. Draw up the volume in the 10 mL syringe: what volume V is that?
1:10 0000.76 mg
V = mL
5.Hard
A vial holds 2000 mg of powder. You add 9.4 mL of diluent, and the powder adds 0.6 mL of volume. The prescription is 620 mg. Draw up the dose: what volume V do you give?
2000 mg9.4 mL + 0.6 mL620 mg
V = mL
6.Hard
Practice exercise (made-up values, not clinical guidance). You must prepare 200 mL of 45% ethanol from a 90% stock and purified water. How many mL V of water do you need? Round to the nearest whole mL.
90%0%45%200 mL
V = mL
Answer key
- 1. m = 4.5 g
- 2. m = 12.5 g
- 3. V = 1.6 mL
- 4. V = 7.6 mL
- 5. V = 3.1 mL
- 6. V = 100 mL
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