Pharmacy calculations worksheet with answers

Practice exercise (made-up values, not clinical guidance). How many g of dextrose are in 20 mL of 50% w/v solution? Find m.

Practice exercise (made-up values, not clinical guidance). A solution of benzalkonium chloride has a ratio strength of 1:2 000. How many milligrams m are in 50 mL?

Practice exercise (made-up values, not clinical guidance). A vial contains ampicillin 500 mg as a powder. The practice label says to add 1.8 mL of sterile water; the powder adds 0.2 mL to the volume. The prescribed dose is 250 mg. What volume V do you draw up? Round to one decimal place.

A solution has a ratio strength of 1:1000. You need 0.8 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

A vial holds 2000 mg of powder. You add 9.5 mL of diluent, and the powder adds 0.5 mL of volume. The prescription is 880 mg. Draw up the dose: what volume V do you give?

Practice exercise (made-up values, not clinical guidance). You must prepare 200 mL of 13% 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.