The mass fraction of salt in the solution is 0.1 25 determine the mass of water that is needed to prepare 400 grams of solution.

Determine the mass of salt in the solution.

To do this, multiply its mass fraction by the weight of the solution.

M salt = 400 x 0.125 = 50 grams;

Let’s calculate the weight of water in the same way.

To do this, multiply its mass fraction by the weight of the solution.

M water (solvent) = 400 x 0.875 = 350 grams;

Let’s check:

50 + 350 = 400;