# ws2302 - 2 0 hot enough to have a vapor pressure of 30 torr...

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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
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Unformatted text preview: 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 KÂ· m-1 and a K b = 0.5 KÂ· 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 Â°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? 8. Based on you understanding of boiling point elevation, why doesn't salting water help food to cook faster? 9. Vapor pressure is often described as a "surface phenomenon." Define this term in your own words to the best of your ability. 10. Raoult's can be used to calculate the decrease in vapor pressure when a non-volatile substance (like salt) is dissolved in a volatile substance (like water). Explain this phenomenon....
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