Question

A unit dose of Levalbuterol HCL contains 3.0 mL in a 0.0417% concentration. How many unit doses are needed in order to obtain 10mg of the active ingredient?

Answer 1

8 unit doses

Explanation:

A 0.0417% concentration means that 100 mL of solution contains 0.0417 grams = 41.7 mg of the active ingredient.

Cross-multiplying

100 mL ------- 41.7 mg

x mL------- 10 mg

100/x = 41.7/10 --------> x = 1000/41.7 = 23.9808 = 24 mL rounding to the nearest integer.

As a unit dose of Levalbuterol HCL contains 3.0 mL,

we need 24/3 = 8 unit doses to obtain 10 mg of the active substance.