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LECTURE9

# LECTURE9 - Midterm 1 Monday Apr 18th In class...

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1 Midterm 1 Monday Apr 18 th In class. Thermochemistry (chap 11) Liquids and Solids (chap 12) Solutions (chap 13) Sample exams on website – guide only Be early. Bring your student ID!! Bring your calculator (clear programmable ones) ! Closed book Solubility of Gases Most gases are less soluble in water as temperature increases. Fish like cold water Air bubbles when water warms in saucepan. In organic solvents the reverse is often true. There is no general rule. Solubility of a gas increases with pressure. (effect of P is much more than T)

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2 Henry’s Law C = k P gas k = C P gas = 23.54 mL N 2 /L 1.00 atm = 23.54 mL N 2 /L/atm Solubility of gas in particular solvent at particular T: e.g. 23.54mL of pure Nitrogen is soluble in 1L of water at 0°C and 1 atm: k C P gas = = 100 mL N 2 /L = 4.25 atm 23.54 mL N 2 /L/atm To dissolve 100mL Nitrogen the pressure must be raised: It is known that water exposed to pure oxygen gas at 1atm and 0°C contains 48.9 mL O 2 /L.
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LECTURE9 - Midterm 1 Monday Apr 18th In class...

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