A 230.-mL sample of a 0.275 M solution is left on a hot plate overnight; the following morning the solution is 1.10 M. What volume of solvent has evaporated from the 0.275 M solution? (Assume volumes are additive.)
A) 288 mL
B) 172 mL
C) 63.3 mL
D)230. mL
E) 58.0 mL

Question

Quizplus · Accepted Answer

The initial moles of solute are 0.275 M * 0.230 L = 0.06325 mol. In the morning, the concentration is 1.10 M, so the volume is 0.06325 mol / 1.10 M = 0.0575 L or 57.5 mL. The volume of solvent evaporated is 230 mL - 57.5 mL = 172.5 mL, rounded to 172 mL.

A 230-ML Sample of a 0