Question

When additional water is added to an aqueous solution, what happens to the concentration of that solution?

Answer 1

decreases

When additional water is added to an aqueous solution, the concentration of that solution decreases. This is because the number of moles of the solute does not change, while the volume of the solution increases. We can set up an equality between the moles of the solute before the dilution  1  and the moles of the solute after the dilution  2 .