How much water should be added to 600 g of a solution containing 40% c to obtain a 12% salt solution?

Let’s find how much salt is contained in 600 g of solution.

We multiply the weight of the solution by the concentration of salt in it.

600 * 40% = 600 * 0.4 = 240 grams of salt.

Find the weight of the new solution.

To do this, divide the resulting mass of salt by the new concentration of salt in it.

240/12% = 240 / 0.12 = 2000 grams.

From this it follows that it is necessary to add to the solution:

2000 – 600 = 1400 grams of water.

Answer:

You need 1400 grams of water.