Question

You are required to reconstitute an oral medication. The dose is 200 mg/tsp. The dry powder is 3.2g with a volume of 10ml. How much water do you add?

1) 50ml
2) 60ml
3) 70ml
4) 80ml

Answer 1

To obtain a medication concentration of 200 mg/tsp, 70 mL of water should be added to the 3.2 g dry powder which has a volume of 10 mL to reach a total volume of 80 mL.

Step-by-step explanation:

The question involves calculating the amount of water needed to reconstitute an oral medication from a dry powder to achieve a specific concentration. The medication's dose is specified as 200 mg/tsp, and the dry powder has a mass of 3.2 g (which is equal to 3200 mg) and must be diluted to a final volume of 10 mL. In order to calculate the total amount of water needed, we must consider that 1 teaspoon (tsp) is approximately 5 mL. The medication will deliver 200 mg in 5 mL; therefore, the 3200 mg will be spread across (3200 mg / 200 mg/tsp) × 5 mL/tsp = 80 mL. The powder is already included in the total volume, so to achieve this total volume, one would subtract the volume of the powder (10 mL) from the desired volume (80 mL), resulting in 70 mL of water needed to be added.