Molality = m = 0.115m Freezing point depression constant of water = Kf = 1.86 oC/m Freezing point depression = Tf = Kf x m = 1.86 x 0.115 = 0.214 oC Freezing point of solution = freezing point of water - Tf = 0.000 - 0.214 = -0.214oC Solution Molality = m = 0.115m Freezing point depression constant of water = Kf = 1.86 oC/m Freezing point depression = Tf = Kf x m = 1.86 x 0.115 = 0.214 oC Freezing point of solution = freezing point of water - Tf = 0.000 - 0.214 = -0.214oC.