Question

5. Which liquid or solution will have the lowest freezing point?

(a) pure H2O
(b) 0.50 m glucose
(c) 0.50 m sucrose
(d) 0.22 m CH3OH
(e) 0.50 m KF

I know enough about chemistry to know that aqueous solutions have a lower freezing point than pure water, so I can infer that (a) will not be the correct answer.

Answer 1

You're correct in your inference. Aqueous solutions typically have lower freezing points than pure water due to the presence of solutes. Among the options provided, (e) 0.50 m KF (potassium fluoride) would have the lowest freezing point. This is due to the concept of colligative properties, where the presence of a solute particles in a solution decreases the freezing point.