Prepare 200 g of 5% CuSo4 solution.

The mass of the solution is 200 grams;

To find the mass of salt, it is necessary to multiply its mass fraction by the mass of the solution.

m salt = 200 x 0.05 = 10 grams;

To find the mass of water, subtract the mass of salt from the mass of the solution:

m of water = 200 – 10 = 190 grams;

The density of water is 1 gram / cm3. To prepare this solution, measure 190 milliliters of water.

Check: 190 + 10 = 200;