Pharmacy calculations worksheet with answers

Practice exercise (made-up values, not clinical guidance). How many g of dextrose are in 500 mL of 5% w/v solution? Find m.

A solution is 0.5% w/v. You need 11.5 mg of the drug. Draw up the volume in the syringe: what volume V is that?

Practice exercise (made-up values, not clinical guidance). A vial contains ampicillin 1000 mg as a powder. The practice label says to add 3.5 mL of sterile water; the powder adds 0.5 mL to the volume. What is the concentration C in mg/mL after reconstitution?

A solution has a ratio strength of 1:1000. You need 0.32 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

A vial holds 1000 mg of powder. You add 4.5 mL of diluent, and the powder adds 0.5 mL of volume. The prescription is 740 mg. Draw up the dose: what volume V do you give?

Practice exercise (made-up values, not clinical guidance). You must prepare 1000 mL of 8% sodium chloride by mixing 23% and 3% sodium chloride. How many mL V of the 3% solution do you need? Round to the nearest whole mL.