In a 250ml solution with 25g of drug, what is the percent strength?

To calculate the percent strength of a solution, you can use the formula:

[

\text{Percent Strength} = \left( \frac{\text{mass of solute (g)}}{\text{volume of solution (mL)}} \right) \times 100

]

In this case, there is 25 grams of the drug in a 250 mL solution. You can plug in the values:

1. Mass of solute: 25 g

2. Volume of solution: 250 mL

So, the calculation becomes:

[

\text{Percent Strength} = \left( \frac{25 , \text{g}}{250 , \text{mL}} \right) \times 100

]

Calculating this gives:

[

\text{Percent Strength} = \left( 0.1 \right) \times 100 = 10%

]

This means that the concentration of the drug in the solution is 10%, indicating that there are 10 grams of drug per 100 mL of solution, which is a standard way of expressing strength in pharmaceutical calculations.

This aligns accurately with the principles of solution concentration