In what mass of water do you need to dissolve 1 mol of potassium hydroxide to get a 14% solution?

Find the mass of potassium hydroxide.

m = n × M.

M (KOH) = 46 g / mol.

m = 46 g / mol × 1 mol = 46 g.

The mass fraction of a substance is calculated by the formula:

W = m (substance): m (solution) × 100%,

Let’s find the mass of the solution.

m (solution) = (m (substance): W) × 100%.

m (solution) = (46 g: 14%) × 100% = 328.57 g.

m (water) = m (solution) – m (substance).

m (water) = 328.57 g – 46 g = 282.57 g.

Answer: 282.57 g.