Calculate the masses of anhydrous acid and its 10% solution to prepare an 80% acetic acid solution weighing 225 g.

Find the mass of water in an 80% acid solution weighing 225 grams.

To do this, multiply the weight of the solution by the mass fraction of water.

M water (solvent) = 225 x 0.2 = 45 grams;

Find the weight of a 10% acid solution with this water content.

M solution 10% = 45 / 0.9 = 50 grams;

Let’s calculate the weight of 100% acid to be added to this solution.

M 100% acid = 225 – 50 = 175 grams;

Let’s check:

50 + 175 = 225;