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L10_CHEM480_JCCYu - Introduction to Analytical Separations...

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1 Introduction to Analytical Separations ± Extraction: the transfer of a solute from one phase to another. ± To isolate the desired analyte ± To concentrate the desired analyte ± To separate the desired analyte form interferences. 2 Recall! 1. Concentrations of solutes should be expressed as moles per liter. 2. Concentrations of gases should be expressed in bars. 3. Concentrations of pure solids, pure liquids, and solvents are omitted because they are unity. 3 Ex. Equilibrium Constant The equilibrium constant for the reaction H 2 O ± H + + OH ± is called K w (= [H + ][OH ± ]) and has the value 1.0 ² 10 ± 14 at 25°C. Given that K HN3 = 1.8 ² 10 ± 5, for the reaction NH 3 ( aq ) + H 2 O ± NH 4 + + OH ± , find K for the reaction NH 4 + ± NH 3 ( aq ) + H + .
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