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December 3

# December 3 - StopDec.1 RaoultsLawProblem ,P,when10.0mLof...

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12/2/10 1 Stop Dec. 1 Raoult’s Law Problem Calculate the vapor pressure lowering, Δ P, when 10.0 mL of glycerol (C 3 H 8 O 3 ) is added to 500. mL of water at 50.0 °C. At this temperature, the vapor pressure of pure water is 92.5 torr and its density is 0.988 g/mL. The density of glycerol is 1.26 g/mL. PLAN: Find the mol frac5on, c, of glycerol in solu5on and mul5ply by the vapor pressure of water.

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12/2/10 2 Prac5ce Problem You add 1.00 kg of ethylene glycol (C 2 H 6 O 2 ) antifreeze to your car radiator, which contains 4450 g of water. What is the freezing point of new the solution? K f H 2 O = 1.86 o C/ m PLAN : Find the # moles of ethylene glycol; m of the solution; multiply by the boiling or freezing point constant; add or subtract, respectively, the changes from the boiling point and freezing point of water. Possible Answers : (A) 0.00673 °C (B) 6.73 °C (C) –6.73 °C (D) 3.62 °C
12/2/10 3 Ion pairing (above) can reduce ”effec5ve” van’t Hoff factor van’t Hoff factor Prac5ce Problem Consider the following aqueous solutions: 0.02 m NaCl, 0.04

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