It is necessary to prepare 250 g of sodium chloride solution in which the mass fraction

It is necessary to prepare 250 g of sodium chloride solution in which the mass fraction of salt is 5%. Calculate how much salt and water you need to take.

The mass of the solution is 250 grams;

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

m salt = 250 x 0.05 = 12.5 grams;

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

m of water = 250 – 12.5 = 237.5 grams;

Check: 237.5 + 12.5 = 250;