What masses of potassium chloride and water should be taken to prepare 80 g of a solution with a salt fraction of 0.2?

Given:

Solution – 80 g,

Mass fraction – 0.2.

Find: masses of potassium chloride and water.

To find the masses of potassium chloride and water, you must use the formula: the mass fraction is equal to the mass of salt divided by the mass of the solution.

Let’s calculate the mass of salt:

80 * 0.2 = 16.

To calculate the required mass of water, you need to subtract the mass of salt from the mass of the solution:

80 – 16 = 64 (g).

Answer: to prepare 80 grams of solution, you need to take 64 grams of water per 16 grams of salt.