How much 20% h2so4 solution and water do you need to take to prepare 300g 10% solution?

Let us determine the masses of the components of the solution.

This requires multiplying their mass fraction by the weight of the solution.

Let’s calculate the weight of the acid.

M acid = 300 x 0.1 = 30 grams;

Find the weight of a 20% acid solution that contains this weight of acid.

M acid solution = 30 / 0.2 = 150 grams;

The water content in it is 150 x 0.8 = 120 grams;

Similarly, we find the weight of the solvent (water).

(In the calculations, we will make the assumption that the density of water is 1 gram / ml).

M water (solvent) = 300 x 0.9 = 270 grams = 270 ml;

Thus, 270 – 120 = 150 grams must be added to a solution of 20% acid weighing 150 grams;

Let’s check. To do this, add the masses of the components of the solution and get the mass of the required solution.

150 + 150 = 300;