Pharmacy calculations worksheet with answers

A solution is 1% w/v. You need 31 mg of the drug. Draw up the volume in the syringe: what volume V is that?

Practice exercise (made-up values, not clinical guidance). How many g of sodium bicarbonate are in 50 mL of 8.4% w/v solution? Find m.

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 2 000 000 units. What volume V do you draw up? Round to one decimal place.

A solution has a ratio strength of 1:10 000. You need 0.28 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

A vial holds 250 mg of powder. You add 2 mL of diluent, and the powder adds 0.5 mL of volume. The prescription is 170 mg. Draw up the dose: what volume V do you give?

Practice exercise (made-up values, not clinical guidance). You must prepare 400 mL of 5% sodium chloride by mixing 23% and 3% sodium chloride. How many mL V of the 23% solution do you need? Round to the nearest whole mL.