Which of the following correctly arranges 1.00 M solutions of the strong electrolytes in order of increasing boiling point (lowest to highest)?
D)All have the same boiling point.

Question

Quizplus · Accepted Answer

The boiling point of a solution is directly proportional to its molality (conc. of solute in mol/kg) and the number of solute particles (ions) that are formed in the solution upon dissociation. 
In this case, all the given solutions are strong electrolytes, so they will completely dissociate into ions in solution.

The solution with the lowest boiling point will have the lowest molality and/or the lowest number of ions. This corresponds to the solution containing the least number of ions, i.e., LiNO3, which will dissociate into Li+ and NO3- ions. 
Next, we have KBr which will dissociate into K+ and Br- ions. 
Finally, we have AlCl3, which will dissociate into Al3+ and 3 Cl- ions.

Therefore, the correct order of increasing boiling point is LiNO3 < KBr < AlCl3, which corresponds to option B.

Which of the Following Correctly Arranges 1