Pharmacy calculations worksheet with answers

Practice exercise (made-up values, not clinical guidance). How many g of sodium chloride are in 1000 mL of 0.9% w/v solution? Find m.

Practice exercise (made-up values, not clinical guidance). A solution of potassium permanganate has a ratio strength of 1:5 000. How many milligrams m are in 100 mL?

Practice exercise (made-up values, not clinical guidance). A vial contains cefazolin 1000 mg as a powder. The practice label says to add 4.5 mL of sterile water; the powder adds 0.5 mL to the volume. What is the concentration C in mg/mL after reconstitution?

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 8.2 mL of diluent. The prescribed dose is 300 000 units. What volume V do you draw up? Round to one decimal place.

A vial holds 2000 mg of powder. You add 1.4 mL of diluent, and the powder adds 0.6 mL of volume. The prescription is 600 mg. Draw up the dose: what volume V do you give?

Practice exercise (made-up values, not clinical guidance). You have 200 g of 20% zinc oxide ointment. How many grams m of plain ointment base (0%) must you add to make a 10% ointment? Round to the nearest whole gram.