For disinfection of wounds, a 5% solution of potassium permanganate is used.

For disinfection of wounds, a 5% solution of potassium permanganate is used. What mass of potassium permanganate and water should be taken to prepare 200 g of solution.

Let’s find the mass of manganese necessary for the preparation of a 5% solution, using the formula for calculating the percentage concentration:

W (in-va) = m (in-va) / m (solution) • 100%.

m (KMnO4) = W (KMnO4) • m (solution) / 100% = 5 • 200/100 = 10 g.

Mass of water for solution preparation:

m (H2O) = m (solution) – m (in-va) = 200 – 10 = 190 g.