How many milligrams of tropicamide are contained in a 0.5% solution?

To determine how many milligrams of tropicamide are present in a 0.5% solution, it is essential to understand what a percentage concentration means in the context of a solution. A 0.5% solution indicates that there are 0.5 grams of the active ingredient in 100 milliliters of solution.

To convert grams to milligrams, recall that 1 gram equals 1000 milligrams. Therefore, 0.5 grams is equivalent to 500 milligrams. If this 500 mg is found in 100 mL of solution, we can find how many milligrams are in a smaller volume, such as 1 mL.

To do this, divide the total milligrams by the total volume in milliliters:

500 mg / 100 mL = 5 mg/mL.

This means that each milliliter of the 0.5% solution contains 5 mg of tropicamide. If you were to have only 0.01 mL (or 10 µL) of this solution, you would have:

5 mg/mL × 0.01 mL = 0.05 mg of tropicamide.

Therefore, if the choice selected indicates that there