Chapter_23_ppt

Chapter_23_ppt - Polyprotic Acid-Base Titrations Titration...

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Polyprotic Acid-Base Titrations Titration of 20.0 mL of 0.100 M H 2 A with 0.100 M NaOH. For H 2 A, K a1 = 1.00 x 10 -3 and K a2 = 1.00 x 10 -7 . What is the pH after 25 mL of NaOH is added?
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Solvent-Solvent Extraction
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Distribution Coefficient
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Distribution Coefficient K = 3.0 V org = 50 mL Solution buffered to pH 6.00 V aq = 100 mL K a = 6.28 x 10 -5 q = ?
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 Five Types of Chromatography   Affinity Chromatography Adsorption Chromatography Partition Chromatography Ion-Exchange Chromatography Size Exclusion Chromatography
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 The Chromatogram   Detector Response Time (sec) t r1 t r2 t r3
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' 1 ' 2 1 2 1 r 2 r k k K K ' t ' t = = = α t r2 > t r1 α > 1.0 → You have a separation!!!  Measures of Retention  Selectivity Coefficient (α) • If you “α” then you the separation between two components. Differential Migration
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t – t ≡ time solute spends in stationary phase  Measures of Retention  Capacity Factor (k’) m s m m r ' n n t t - t k = =
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 Measures of Retention  Capacity Factor (k’) m s m m r ' n n t t - t k = =
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 Fraction of Solute in Mobile Phase  Think about Solvent/Solvent Extraction → How much solute was extracted or was left behind.
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 Fraction of Solute in Mobile Phase  Fraction of Solute in Mobile Phase: Fraction of Solute in Stationary Phase:
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This note was uploaded on 03/31/2008 for the course CHEM 241 taught by Professor Tiani during the Spring '08 term at UNC.

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Chapter_23_ppt - Polyprotic Acid-Base Titrations Titration...

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