To prepare 150 g of a solution of copper sulfate 2 with a mass fraction of 0.5%, a mass of salt is required.

The solution consists of two components. Dissolved substance (vitriol) and solvent (water).

The weight of the solution is 150 grams.

Let’s calculate the weight of vitriol.

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

M substance = 150 x 0.5% = 0.75 grams;

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

M solvent = 150 x 99.5% = 149.25 grams;

The density of water is 1 gram / cm3. Therefore, you need to measure out 149.25 ml. water so that the weight in the solution is 149.25 grams.

Check: M vitriol + M solvent = M solution = 0.75 + 149.25 = 150 grams;