1.Easy
Practice exercise (made-up values, not clinical guidance). How many g of sodium chloride are in 250 mL of 0.9% w/v solution? Find m.
0.9% w/v250 mL
m = g
Pharmacy calculations worksheet with answers
2.Easy
Practice exercise (made-up values, not clinical guidance). How many g of sodium chloride are in 500 mL of 3% w/v solution? Find m.
3% w/v500 mL
m = g
3.Medium
Practice exercise (made-up values, not clinical guidance). A vial contains ceftriaxone 1000 mg as a powder. The practice label says to add 9.6 mL of sterile water; the powder adds 0.4 mL to the volume. What is the concentration C in mg/mL after reconstitution?
1000 mg9.6 mL+0.4 mL
C = mg/mL
4.Medium
Practice exercise (made-up values, not clinical guidance). A vial contains cefuroxime 750 mg as a powder. The practice label says to add 7.2 mL of sterile water; the powder adds 0.3 mL to the volume. What is the concentration C in mg/mL after reconstitution?
750 mg7.2 mL+0.3 mL
C = mg/mL
5.Hard
A vial holds 2000 mg of powder. You add 4.6 mL of diluent, and the powder adds 0.4 mL of volume. The prescription is 640 mg. Draw up the dose: what volume V do you give?
2000 mg4.6 mL + 0.4 mL640 mg
V = mL
6.Hard
Practice exercise (made-up values, not clinical guidance). You must prepare 500 mL of 5% chlorhexidine from a 20% stock and purified water. How many mL V of water do you need? Round to the nearest whole mL.
20%0%5%500 mL
V = mL
Answer key
- 1. m = 2.25 g
- 2. m = 15 g
- 3. C = 100 mg/mL
- 4. C = 100 mg/mL
- 5. V = 1.6 mL
- 6. V = 375 mL
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