Potassium – nitrate weighing 4.5 g was dissolved in water weighing 60 g. Determine the mass fraction

Potassium – nitrate weighing 4.5 g was dissolved in water weighing 60 g. Determine the mass fraction of potassium nitrate in the solution

To find the mass fraction of salt in a solution, it is necessary to divide the mass of the dissolved salt by the total mass of the solution, which consists of the masses of the solvent and solutes.

Find the mass of the solution:

m (solution) = 60 + 4.5 = 64.5 g;

Let’s find the mass fraction of salt:

w (KNO3) = 4.5 / 64.5 = 0.07 = 7%.

Answer: w (KNO3) = 7%.