If a pharmacist added each of the following to 22-g packages of 2% mupirocin ointment, what would be the percentage strengths of the resulting ointments:

Question

(a) 0.25 g mupirocin powder and (b) 0.25 g o nonmedicated ointment base? (answer

to two decimal places)

By applying: Altering Strength, Stock Solutions, and Alligation Calculations

Answer 1

Adding 0.25 g mupirocin and 0.25 g base to 22 g of 2% mupirocin

22 g x 2% = 0.44 g mupirocin in original package

adding 0.25 g = 0.44 + 0.25 = 0.69 g mupirocin

adding 0.25 g of base = 22 g + 0.25 g = 22.25 g

Result is 0.69 g mupirocin in a total of 22.25 g

Resulting strength = 0.69 g / 22.25 g (x100%) = 3.10% mupirocin