To 80 g of a solution in which the mass fraction of potassium nitrate is 20%, 4 g of salt was added.

| July 6, 2021 | education

To 80 g of a solution in which the mass fraction of potassium nitrate is 20%, 4 g of salt was added. Calculate the mass fraction of potassium nitrate in the resulting solution.

Potassium Nitrate Formula: KNO3.
1) Find the mass of the solute potassium nitrate in its solution. To do this, multiply the mass fraction of potassium nitrate by the mass of the entire solution and divide by one hundred percent: 20 * 80/100 = 16g.
2) Find the mass of the solute after adding salt. To do this, add the mass of the solute before adding salt and the mass of salt: 16 + 4 = 20g.
3) Find the mass of the solution after adding salt. Add the initial mass of the solution and the mass of salt: 80 + 4 = 84g.
4) Find the mass fraction of potassium nitrate in the resulting solution: 20/84 * 100 = 23.8% – the answer.



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