What is the maximum amount of active ingredient in a 20 gm prescription of a 10% solution?

To determine the maximum amount of active ingredient in a 20 gram prescription of a 10% solution, it’s essential to understand how percentages work in the context of solutions. A 10% solution means that there are 10 grams of active ingredient for every 100 grams of solution.

In this case, since the prescription is for 20 grams of the solution, we calculate the active ingredient as follows:

1. Calculate what 10% of 20 grams is:

• 10% of 20 grams = (10/100) x 20 = 2 grams.

This calculation indicates that in a 20 gram volume of a 10% solution, there are 2 grams of the active ingredient present. Thus, the correct answer reflects this calculation, establishing that the maximum amount of active ingredient in this specific prescription of 20 grams is indeed 2 grams.