A pot contains 7 l of brine at a concentration of 80 g/l. how much of the water should be boiled off to increase the concentration to 200 g/l?

Question

Chemistry

Pierce Pham

23 March, 00:29

A pot contains 7 l of brine at a concentration of 80 g/l. how much of the water should be boiled off to increase the concentration to 200 g/l?

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Rachael Warren · Answer 1

When the solution boils, only the solvent is converted to gas. The solute remains in the solution, so its amount does not change but the concentration does. The amount of solute is:

Amount of solute = 80 g/L * 7 L = 560 g

In order for concentration to be 200 g/L

200 g/L = 560 g/Volume

Volume = 2.3 L

There should be 2.3 L of brine solution. So, the amount of water boiled off is:

Amount of Water = 7 L - 2.3 L = 4.2 L water