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American Association Of Veterinary State Boards (AAVSB) Practice Exam

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A vial contains 2,000,000 units. To make a solution containing 200,000 units per milliliter, how many milliliters of diluent are needed?
Correct Answer:
10 mL
Explanation:
The main idea here is that concentration relates to how much active units are present per milliliter, so to find the required volume you divide the total units by the desired concentration. You have 2,000,000 units and want 200,000 units per milliliter. 2,000,000 ÷ 200,000 = 10. This means you need a total of 10 milliliters of solution to hold all the units at that concentration. The diluent would be added to bring the solution up to that total volume. In other words, the amount of diluent is whatever is needed to reach 10 mL total.

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