Answer:
First, let's consider the ratio: 1:25. This means that for every 1 gram of solute, we have 25 milliliters of solvent. Therefore, if we have 100 milliliters of the solution, we can set up a proportion to find the amount of solute in grams:
1 gram solute / 25 milliliters solvent = x grams solute / 100 milliliters solution
Cross-multiplying, we get:
25 * x = 1 * 100
25x = 100
x = 100 / 25
x = 4
So, in 100 milliliters of a 1:25 (weight/volume) solution, there are 4 grams of solute.
To calculate the percent strength, we divide the mass of the solute (4 grams) by the volume of the solution (100 milliliters) and multiply by 100:
Percent strength = (mass of solute / volume of solution) * 100
Percent strength = (4 g / 100 mL) * 100
Percent strength = 4%
Therefore, the percent strength of a 1:25 (weight/volume) solution is 4%.