Question

A vial of penicillin contains 2,000,000 units of the dry drug. To make the penicillin into a solution that contains 400,000 units per milliliter, how much diluent is needed?

A. 2 mL
B. 4 mL
C. 5 mL
D. 10 mL

Answer 1

To make a penicillin solution of 400,000 units per milliliter, 5 mL of diluent is needed.

Step-by-step explanation:

To make the penicillin into a solution that contains 400,000 units per milliliter, we need to dilute the 2,000,000 units with a certain amount of diluent. Let's use the formula:

Diluent volume = Initial volume / Desired concentration

Given that the initial volume is 2,000,000 units and we want a concentration of 400,000 units/mL, we can plug in the values to solve for the diluent volume:

Diluent volume = 2,000,000 units / 400,000 units/mL = 5 mL

Therefore, the correct answer is C. 5 mL.