Pharmacy calculations worksheet with answers

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.

A solution is 5% w/v. You need 170 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 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. The prescribed dose is 750 mg. What volume V do you draw up? Round to one decimal place.

A solution has a ratio strength of 1:10 000. You need 0.82 mg. Draw up the volume in the 10 mL syringe: what volume V is that?

Practice exercise (made-up values, not clinical guidance). You must prepare 600 mL of 4% chlorhexidine from a 20% stock and purified water. How many mL V of water do you need? Round to the nearest whole mL.

A vial holds 250 mg of powder. You add 4.4 mL of diluent, and the powder adds 0.6 mL of volume. The prescription is 130 mg. Draw up the dose: what volume V do you give?