Calculate the mass of sodium chloride and water required to prepare a 500 g solution containing 5% salt.

The solution consists of two components. Dissolved substance and solvent.

The weight of the solution is 500 grams.

Let’s calculate the weight of the salt.

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

M salt = 500 x 0.05 = 25 grams;

In a similar way, we calculate the weight of the solvent.

M solvent = 500 x 0.95 = 475 grams;

The density of water is 1 gram / cm3. Therefore, you need to measure out 475 ml. water so that the weight in the solution is 475 grams

Checking: M salt + M solvent = M solution = 25 + 475 = 500 grams;