Choose the aqueous solution below with the highest freezing point.These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable. A) 0.200 m Mg(ClO₄)₂ B) 0.200 m Na₃PO₃ C) 0.200 m HOCH₂CH₂OH D) 0.200 m Ba(NO₃)₂ E) These all have the same freezing point.

Question

Quizplus · Accepted Answer

The freezing point depression is directly proportional to the molality of the solution, so the solution with the highest molality will have the highest freezing point. Since all of these solutions have the same molality, we need to consider other properties. Na+ and Mg2+ are both highly charged ions and will experience greater ion-ion interactions and therefore lower freezing points. Ba2+ is larger and will also have lower ion-ion interactions compared to smaller ions like Na+ and Mg2+. HOCH2CH2OH is a polar molecule and will have weaker interactions than any of the ions. Therefore, C (HOCH2CH2OH) will have the highest freezing point.

Choose the Aqueous Solution Below with the Highest Freezing Point