To 16 g of technical potassium hydroxide containing 12.5 impurities, a nitric acid solution was added

To 16 g of technical potassium hydroxide containing 12.5 impurities, a nitric acid solution was added to determine the mass of the salt obtained.

KOH + HNO3 = KNO3 + H2O.
1) Calculation of the mass of impurities in technical potassium hydroxide: 16 * 12.5 / 100 = 2g.
2) Determination of the mass of pure potassium hydroxide substance: 16 – 2 = 14g.
3) Calculation of the molar mass of potassium hydroxide: 39 + 1 + 16 = 56.
4) The amount of potassium hydroxide substance: 14/56 = 0.25 mol.
5) According to the reaction equation, the amount of potassium hydroxide and potassium nitrate is 1: 1. This means that the amount of potassium nitrate is 0.25 mol.
6) The mass of potassium nitrate is: 0.25 * (39 + 14 + 16 * 3) = 25.25 g – the answer.