You dissolved 20g of a drug in 500 ml of solution. What is the percent strength of the solution?

To determine the percent strength of a solution, the formula used is:

[

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

]

In this case, you have 20 grams of the drug as the solute and a total solution volume of 500 milliliters. Plugging these values into the formula:

[

\text{Percent strength} = \left( \frac{20 , \text{g}}{500 , \text{ml}} \right) \times 100

]

Calculating this step-by-step:

1. First, divide the mass of the drug by the volume of the solution:

[

\frac{20 , \text{g}}{500 , \text{ml}} = 0.04 , \text{g/ml}

]

2. Then, to convert this into a percentage, multiply by 100:

[

0.04 \times 100 = 4%

]

Thus, the percent strength of the solution is 4%. This indicates that