Calculate the boiling point of a 4.0 m solution of sucrose in water. Sucrose is a nonelectrolyte. The normal boiling point of pure water is 100.0ºC. K_b (water)= 0.52ºC/m. A)2.1ºC B)97.9ºC C)96.0ºC D)94.0ºC E)102.1ºC

Question

Quizplus · Accepted Answer

The boiling point elevation can be calculated using the formula ΔTb = i * Kb * m, where ΔTb is the boiling point elevation, i is the van't Hoff factor (which is 1 for a nonelectrolyte like sucrose), Kb is the ebullioscopic constant of the solvent (water in this case, which is 0.52ºC/m), and m is the molality of the solution. For a 4.0 m solution of sucrose, ΔTb = 1 * 0.52ºC/m * 4.0m = 2.08ºC. The boiling point of the solution is then 100.0ºC + 2.08ºC = 102.08ºC, which rounds to 102.1ºC.

Calculate the Boiling Point of a 4