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# ws3s09key - CH302 Worksheet 2Colligative Properties All of...

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CH302 Worksheet 2—Colligative Properties All of this is intended to be done without the aid of a calculator. All of the calculations are designed such that approximating should be straight-forward and produce a correct result. 1. Based on the physical constants involved, which colligative property has the greatest magnitude for a solution of a given concentration? Which can't be compared in this way? Why? 2. Which colligative properties have a linear concentration dependence? Write their equations. 3. Rank the following aqueous solutions in terms of increasing boiling point: 3 m sugar, 2 m NaCl, 0.5 m Mg(OH) 2 , 5 m AlN, 1 m urea. 4. Assuming a cell wall can withstand an osmotic pressure of 1 atmosphere and the concentration of Na + in a cell is 50 mM, approximate the [Na + ] outside the cell that would cause lysis. 5. If you dissolved 28 grams of NaCl in 90 grams of pure H 2 0 hot enough to have a vapor pressure of 30 torr, what will the new vapor pressure be? 6. Assuming standard conditions and a K f = 0.2 K· m -1 and a K b = 0.5 K· m -1 for water, what would be the freezing point of a solution that boiled at 375.5 K? Express your answer in both K and °C. 7. Based on the question above and assuming 1 kg of water, how many moles of NaCl would be needed to produce this effect? What about sugar?

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