Calculate the mass of water and salt required to prepare 150 grams of solution with a mass fraction = 3%.

Let’s calculate the weight of the dissolved salt.

M salt = 150 x 0.03 = 4.5 grams;

In the same way, we find the weight of the solvent (water).

(In the calculations, we take the density of water equal to 1 gram / cm3).

M water (solvent) = 150 x 0.97 = 145.5 grams = 145.5 ml;

Let’s check. To do this, add the masses of the components of the solution and get the mass of the required solution.

145.5 +4.5 = 150;