How many grams of water are in 250 g of an aqueous solution of salt with a 2.5% concentration?

First, we find out how much salt is in the solution. Let’s take 250 g of solution for 100%. We can make a proportion:

250 g – 100%

X g – 2.5%.

Let’s solve this proportion:

100 * X = 250 * 2.5;

100 * X = 625;

X = 6.25 (g) – salts in solution.

250 – 6.25 = 243.75 (g) – water in solution.

Answer: 243.75 grams of water in a solution.