Pure benzene has a freezing point of 5.5oC and a boiling point of 80.1o C. What are the
expected freezing point and boiling point for a 0.15 solution of a nonvolatile solute inbenzene?
For benzene, Kf = 5.12 oC/m and Kb = 2.53 oC/m.
ΔTf = mKf =0.15 x 5.12 = 0.768 oC
Freezing point of solution =4.7 oC
ΔTb = mKb = 0.15 x 2.53 = 0.3794oC
Boiling point of the solution = 80.5 oC
Pure benzene has a freezing point of 5.55oC and a boiling point of 81.1o C. What are the
expected freezing point and boiling point for a 0.35solution of a nonvolatile solute inbenzene?
For benzene, Kf = 5.12 oC/m and Kb = 2.53 oC/m.
ΔTf = mKf =0.35 x 5.12= 1.79 oC
Freezing point of solution =3.8 oC
ΔTb = mKb = 0.35 x 2.53 = 0.885oC
Boiling point of the solution = 82.0 oC
Pure benzene has a freezing point of 3.33oC and a boiling point of 84.5o C. What are the
expected freezing point and boiling point for a 0.27solution of a nonvolatile solute inbenzene?
For benzene, Kf = 5.12 oC/m and Kb = 2.53 oC/m.
ΔTf = mKf =0.27 x 5.12 = 1.382 oC
Freezing point of solution =1.9oC
ΔTb = mKb = 0.27 x 2.52 = 0.6831oC
Boiling point of the solution = 85.2 oC
Pure benzene has a freezing point of 2.37oC and a boiling point of 79.5o C. What are the
expected freezing point and boiling point for a 0.46solution of a nonvolatile solute inbenzene?
For benzene, Kf = 5.12 oC/m and Kb = 2.53 oC/m.
ΔTf = mKf =0.46x 5.12 = 2.3552 oC
Freezing point of solution =1.5E-2 oC
ΔTb = mKb = 0.46 x 2.53 = 1.164oC
Boiling point of the solution = 80.7 oC