For a solution containing 1000mg of a drug in 500mL, what is the concentration in mg/mL?

To determine the concentration of a solution, you divide the amount of the drug by the volume of the solution. In this case, you have 1000 mg of the drug in a total volume of 500 mL.

Calculating the concentration involves the following steps:

1. Take the total amount of the drug: 1000 mg.

2. Divide that by the total volume of the solution: 500 mL.

So, the calculation is:

1000 mg ÷ 500 mL = 2 mg/mL.

This result indicates that there are 2 milligrams of the drug present for every milliliter of solution. Thus, the concentration of the solution is correctly identified as 2 mg/mL. Understanding this simple formula for concentration can be very helpful in pharmacy practice, where precise measurements are critical for ensuring safe and effective medication administration.