Isopropyl alcohol has a boiling point of 82.3°C. Solutions of isopropyl alcohol in water have normal boiling points less than 100°C. Is this observation consistent with the following equation? Explain. $\Delta$T_b = iK_bm A) No, boiling point elevation only pertains to ionic solutes. B) No, boiling point elevation only pertains to nonvolatile solutes. C) Yes, boiling point depression occurs for all solutions. D) Yes, the boiling point depression constant for isopropyl alcohol is large. E) No, isopropyl alcohol can hydrogen bond with water.

Question

Quizplus · Accepted Answer

Boiling point elevation occurs when a nonvolatile solute is added to a solvent, which increases the boiling point of the solution. However, in this case, the observed normal boiling points of solutions of isopropyl alcohol in water are less than 100°C, which is the normal boiling point of water. This indicates that the isopropyl alcohol is acting as a volatile solute, causing a lowering of the boiling point of the solution. Therefore, choice B is the best answer, as boiling point elevation only pertains to nonvolatile solutes.

Isopropyl Alcohol Has a Boiling Point of 82 Δ\DeltaΔ Tb = IKbm A) No, Boiling Point Elevation Only Pertains

Isopropyl Alcohol Has a Boiling Point of 82 $\Delta$ T_b = IK_bm
A) No, Boiling Point Elevation Only Pertains