posted by Kim .
the following questions are about colligative properties:
a)How much would the freezing point change in a 2.5 solution of phenol in benzene?
b)how much would the boiling point change in a 1.m solution of magnesium chloride in ethanol?
c)Does adding sugar to water raise or lower the vapor pressure of water? why?
a) delta T = Kf*m
b) delta T = *Kb*m
c) The vapor pressure is ALWAYS less (for ideal solution) when a non-volatile solute is added to a volatile solvent. Why? Think about the sugar molecules getting in the way of the water molecules and they (the water molecules) can't escape as easily.