Question

How much water should be added to 15grams of salt to obtain 15% of salt solution?

Answer 1

Here, mass of the solute (i.e. salt) = 15 g and the required concentration of the solution is 15 %.

Let the mass of water be a grams.

So,

15 = [15 / (15 + a)] X 100

Solving for a, we get

a = (100 - 15)g = 85 g