How many grams of sodium chloride and water do you need to take to prepare 240 g of a 15% solution of this salt?

Find the weight of the dissolved salt.

M salt = 240 x 0.15 = 36 grams;

Similarly, we find the weight of the solvent (water).

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

M water = 240 x 0.85 = 204 grams = 204 ml;

Let’s check. To do this, we sum up the masses of the components of the solution and obtain the mass of the solution in question.

204 + 36 = 240;