ReviewExam3 - Factors Affecting Solubility Pressure Effects...

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Factors Affecting Solubility Factors Affecting Solubility Pressure Effects Pressure Effects Henry’s Law: C g is the solubility of gas, P g the partial pressure, k = Henry’s law constant. Eg. Carbonated beverages are bottled under > 1 atm. gg Ck P = Higher pressures lead to Higher pressures lead to greater solubility greater solubility P g C g
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27 g of acetylene, C 2 H 2 , dissolves in 1L of acetone at 1atm. If the partial pressure of acetylene is increased to 12 atm, what is its solubility in acetone? 11 22 Ck P P = = 27g/L 1 atm ? 12 atm 2 1 2 2 21 1 = 12 27 3.2 10 1 PP P ga t m g CC PL a t m L = == × = ×
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° Χ = A A A P P Raoult Raoult ’s Law Law The partial pressure of solvent, P A , over a solution equals the vapor pressure of pure solvent, P A o , times the mole fraction of solvent, X A , in solution. () 1 1 1 AA A A A A AB B A PP P PX P PP XP P X but X XX X Δ Δ= ° ° = °− +=⇒= Vapor Pressure Lowering BA P P Δ =Χ °
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The Calculate the vapor-pressure lowering of water when 5.67g of C 6 H 12 O 6 is dissolved 25.2g of water at 25 o C. The vapor pressure of water at this temp is 23.8 mm Hg 6 1 26 61 2 6 22 2 Glucose (MM=180.2g) 1 5.67g 0.0315 180.2 Water (MM=18g) 1 25.2g 1.4 18 moles mol CH O mo lCH O gCH O moles mol HO lHO gHO ×= BA P P Δ=Χ ° () 0.0315 mol 0.022 0.0315 1.4 mol 0.022 23.8 mmHg 0.524 mmHg B o X PXP == + Δ= = × =
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Colligative Properties Colligative Properties Freezing Freezing -Point Depression Point Depression
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This note was uploaded on 04/28/2008 for the course CHEM 132 taught by Professor Laceyandhanson during the Spring '08 term at SUNY Stony Brook.

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ReviewExam3 - Factors Affecting Solubility Pressure Effects...

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