<p> Colligative Properties Worksheet</p><p>Complete the following questions and problems relating to colligative properties.</p><p>1) Write the mathematical expression for boiling point elevation. Define all of the terms used.</p><p>2) Write the mathematical expression for freezing point depression. Define all of the terms used.</p><p>3) When sugar is dissolved in water, will the resulting solution boil at a higher or lower temperature than pure water? Explain.</p><p>4) When salt is dissolved in water, will the resulting solution freeze at a higher or lower temperature than pure water? Explain.</p><p>5) What is the change in boiling point (vs. pure water) of a 1.25 molal solution of o sugar in water? The Kb for water is 0.52 C/m. Assume i = 1. 6) What is the change in freezing point (vs. pure water) of a 0.78 molal solution o of NaCl in water? The Kf for water is 1.86 C/m. Assume i = 2 for NaCl.</p><p>7) A solution was prepared by dissolving 0.42 mol hexane into 500g CCl4. What is the change in freezing point (vs. pure CCl4) of this solution? The Kf for CCl4 is 30.0oC/m. Assume i = 1 for hexane.</p><p>8) A solution was prepared by dissolving 0.16 mol ethanol into 750g ether. What is the change in boiling point (vs. pure ether) of this solution? The K b for ether is 2.02oC/m. Assume i = 1 for ethanol.</p><p>9) A solution of propylene glycol (antifreeze) in your car’s radiator has a freezing o o point of –20 C. What is the molality of the solution? Kf for water is 1.86 C/m. Assume i = 1 for propylene glycol. 10) In order to make spaghetti cook faster, a chef adds salt to water. How many moles of salt would he need to add to 1.0 kg water to make the water boil at o o 105 C? The Kb for water is 0.25 C/m. Assume i = 2 for NaCl.</p><p>11) How many grams of NaCl would the chef in problem 10 need to add?</p>