# Oct_10 - Henry's Law: P gas ,above = K H X gas , solution K...

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Carbon What phase of carbon is stable at ambient conditions?

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Critical Phenomena above T c and P c a supercritical fluid forms it is neither liquid or vapour but has properties of both Supercritical Carbon Dioxide supercritical CO 2 is commonly used in industrial applications, e.g., decaffeination of coffee beans supercritical H 2 O is very different from regular water e.g., it dissolves organic compounds well
Applications Oxidation Extended Phase Diagram for H 2 O

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Solutions Solutions are composed of solutes dissolved in solvents . Not just solids/liquids/gases in liquid. Any homogeneous mixture is called a solution. molarity: M = moles solute volume solution M = mol L molality: m = moles solute mass of solvent m = mol Kg mole fraction: X solute = n solute n solute n solvent
Henry's Law Gas solubility increases as the pressure of the gas over the solution increases. Solubility increase is due to a higher rate of gas absorption vs. gas evolution

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Unformatted text preview: Henry's Law: P gas ,above = K H X gas , solution K H depends on the solvent, gas, and temperature Henry's law is only exact under ideal conditions, i.e, low gas Henry's Law Calculation What is the solubility of atmospheric oxygen at 20C ? K H (O 2 ) = 3.00 x 10 7 torr @ 20C in water P oxygen = (.21)(1atm) (760 torr / atm) = 159.6 torr X oxygen = P oxygen K H = 159.6 torr 3.00 x 10 7 torr = 5.32 x 10 6 In 100 g of water (5.56 mol): n oxygen = (5.32 x 10-6 )(5.56) = 2.98 x 10-5 mol Solubility = 0.000946 g / 100 g water Physical Properties of Solutions The physical properties of pure solvents change when solutes are dissolved in them These colligative properties include: lowering of equilibrium vapour pressure elevation of b.p. freezing point depression osmotic pressure...
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## This note was uploaded on 01/20/2011 for the course CHEM 154 CHEM 154 taught by Professor Yang during the Spring '10 term at The University of British Columbia.

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Oct_10 - Henry's Law: P gas ,above = K H X gas , solution K...

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