4. Explain (at the molecular level) why the presence of a solute lowers the freezing point of a solution, and at the same time raises the boiling point. Zero degrees on the Farenheit temperature scale (17.8C) is based on the temperature that a saturated salt (NaCl) solution freezes at. Calculate the molality of the saturated solution assuming 100% ionization. Would the actual molality most likely be higher or lower than this value? (Kf for water is 1.86C/m)