Question

We can dilute an aqueous solution by adding liquid water to the solution, resulting in a less concentrated solution. Which of the following would result in a more concentrated solution?
(A) decreasing the number of moles of solute
(B) adding ice to the solution and allowing the ice to melt
(C) evaporating some of the water contained in the solution
(D) none of the above

Answer 1

Answer: = C

Explanation:

evaporating some of the water contained in the solution will increase the concentration of the resulting solution, because there will be concomitant increase in the number of moles of the solute left in the solution.