What is the percentage strength of a solution that contains 15 grams of drug in 150ml?

To determine the percentage strength of a solution, you can use the formula for percentage concentration, which is defined as the mass of solute divided by the volume of solution, multiplied by 100.

In this case, you have 15 grams of drug in 150 milliliters of solution. To calculate the percentage strength:

1. Start by dividing the mass of the drug by the volume of the solution:

[

\frac{15 \text{ grams}}{150 \text{ ml}} = 0.1 \text{ grams per ml}

]

2. Next, to find the percentage, multiply the result by 100:

[

0.1 \text{ grams per ml} \times 100 = 10%

]

Thus, the percentage strength of the solution is 10%. This means that 10% of the solution's volume is made up of the active drug ingredient, which indicates its concentration. The correct answer reflects a direct calculation based on the understanding of how to find percentage strength, showcasing a fundamental concept in pharmacy practice regarding dilutions and concentrations.