Question

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

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

Answer 1

To get a 200 mg/tsp concentration from 3.2 g of powder equivalent to 3200 mg, 70 ml of water should be added to the existing 10 ml volume to make a total volume of 80 ml.

Step-by-step explanation:

To reconstitute an oral medication with a dose of 200 mg/tsp, from the dry powder of 3.2 g, we need to determine how much water should be added to achieve our desired concentration. Since 3.2 grams is equal to 3200 mg and we are working with a 10 ml volume, we need to calculate the volume of water required to achieve the 200 mg/tsp (5 ml) concentration.

Firstly, we convert the 3200 mg powder into the same concentration units as required:

1. 3200 mg of the powder divided by 200 mg/tsp gives us 16 tsp.
2. Since there are 5 ml in a teaspoon, 16 tsp is equivalent to 16 * 5 ml = 80 ml.
3. Therefore, to get to the 10 ml volume we have, we need to add 80 ml - 10 ml = 70 ml of water.

Thus, the correct answer is to add 70 ml of water.