Two aqueous solutions are prepared: 2.0 m Cu(NO₃)₂and 2.0 m NaBr. Which of the following statements is true? A) The Cu(NO₃)₂solution has a higher vapor pressure and lower freezing point than the NaBr solution. B) The Cu(NO₃)₂solution has a higher vapor pressure and higher freezing point than the NaBr solution. C) The Cu(NO₃)₂solution has a lower vapor pressure and lower freezing point than the NaBr solution. D) The Cu(NO₃)₂solution has a lower vapor pressure and higher freezing point than the NaBr solution. E) None of the above statements is true.

Question

Quizplus · Accepted Answer

The Cu(NO3)2 solution has a lower vapor pressure and lower freezing point than the NaBr solution because it dissociates into more ions (3 ions: Cu^2+ and 2 NO3^-) compared to NaBr (2 ions: Na^+ and Br^-), leading to a greater colligative effect.

Two Aqueous Solutions Are Prepared: 2