To 90 g of a 20% potassium chloride solution was added 10 g of salt. Calculate the mass fraction

To 90 g of a 20% potassium chloride solution was added 10 g of salt. Calculate the mass fraction of the solute in the resulting solution.

The mass of the solution is 90 grams;

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

m salt = 90 x 0.2 = 18 grams;

Adding 10 grams of salt to the solution, its mass will increase and will be 90 + 10 = 100 grams. The mass of salt in the new solution will be 18 + 10 = 28 grams.

The salt concentration in the new solution will be:

With salt 2 = 28/100 = 0.2 = 20%;