Pharmacy calculations worksheet with answers

A solution is 0.5% w/v. You need 3.5 mg of the drug. Draw up the volume in the syringe: what volume V is that?

Practice exercise (made-up values, not clinical guidance). 20 g of glycerin is dissolved in water to a total volume of 100 mL. What is the percentage strength p (% w/v)?

A solution has a ratio strength of 1:1000. You need 0.51 mg. Draw up the volume in the 1 mL syringe: what volume V is that?

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. What is the concentration C in mg/mL after reconstitution?

Practice exercise (made-up values, not clinical guidance). You must prepare 1000 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.

Practice exercise (made-up values, not clinical guidance). You must prepare 500 mL of 40% dextrose by mixing 70% and 10% dextrose. How many mL V of the 10% solution do you need? Round to the nearest whole mL.