How many milliliters of a 25% solution contain 10 g of the pure drug?

To calculate the number of milliliters of a 25% solution that contain 10g of the pure drug, we need to determine the concentration of the solution and then use a simple formula to calculate the volume.

Step 1: Convert the percentage concentration to a decimal. In this case, 25% becomes 0.25.
Step 2: Use the formula:

Volume (ml) = (Amount of drug (g) / Concentration) * 100

In this case, the formula becomes:

Volume (ml) = (10g / 0.25) * 100

Now let's calculate:

Volume (ml) = 40 * 100
Volume (ml) = 4000 ml

Therefore, 4000 milliliters of a 25% solution would contain 10 grams of the pure drug.