# What volume of water should be taken to prepare 500 g of a potassium nitrate solution with

What volume of water should be taken to prepare 500 g of a potassium nitrate solution with a mass fraction of a dissolved substance of 15%?

Let’s calculate the masses of the components of the solution.

To do this, it is necessary to multiply their mass fraction by the weight of the solution.

Determine the weight of the dissolved salt.

M salt = 500 x 0.15 = 75 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 = 500 x 0.85 = 425 grams;

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.

425 + 75 = 500;

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