Question

Which aqueous solution will have the lowest freezing point?

A) 0.10 m HCl
B) 0.050 m CaCl₂
C) 0.20 m C₁₂H₂₂O₁₁
D) 0.15 m NaCl

Answer 1

The aqueous solution with the lowest freezing point is 0.2 m NaCl, while the highest freezing point is 0.20 m C₁₂H₂₂O₁₁. The concentration of solute particles in a solution determines the lowering of the freezing point.

Step-by-step explanation:

The aqueous solution with the lowest freezing point is 0.2 m NaCl. The freezing point decreases with increasing concentration of solute particles. NaCl dissociates into two ions (Na+ and Cl-) in solution, so it has more particles compared to the other options. CaCl₂ has three ions per formula unit, but its concentration is lower, so it has a slightly higher freezing point. C₁₂H₂₂O₁₁ (sucrose) does not dissociate into ions and has the highest freezing point among the given options.