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March 6,2009

# March 6,2009 - March 6,2009 Thin glass permeable to H but...

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March 6,2009

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Thin glass permeable to H + but not anions Inside Outside 2x10 -6 ? Measure Δψ = ψ i – ψ o = -25ln{[H] I /[H] o ) Δψ = +18mV 18 = -25ln{2x10 -6 /[H] o } 0.7 = - ln{2x10 -6 /[H] o } 2 = + [H] o /2x10 -6 [H] o = 4x10 -6
Osmotic Pressure Π = RT c c concentration RT = 25 L atm mol -1 1M solution against pure water pure water moves into solution to “dilute” so both concentrations approach each other/ Excess water pressure opposes this flow to keep an equilibrium

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Π = 1M (RT) = 1x25 = 25 atm. 1atm supports 33ft of water 25 atm support 820 feet of water
First Law of Thermodynamics Energy is conserved Heat q [ system ] work (w) q w both forms of energy If added to system, the internal energy E goes up by ΔE comes from either q or w

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First Law ΔE = q + w Many different ways to get same ΔE q w ΔE 50 0 50 100 -50 50 -20 +70 50 Once inside not heat or work just internal energy
Using heat and work requires calculation For ideal gases, change in energy is proportional to change in temperature T ΔE = C v ΔT = C v (T f – T i ) • C v molar heat capacity [Jmol -1 K -1 ]

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