What mass of potassium sulfate and how much water do you need to take to prepare 250 grams of a 15% salt solution?

The mass of the solution is 250 grams;

To find the mass of salt, it is necessary to multiply its mass fraction by the mass of the solution.

m salt = 250 x 0.15 = 37.5 grams;

To find the mass of water, subtract the mass of salt from the mass of the solution:

m water = 250 – 37.5 = 212.5 grams;

The density of water is 1 gram / cm3;

The volume of water will be 212.5 x 1 = 212.5 ml.

Check: 212.5 + 37.5 = 250;