Titration

Titration - 1 Titrant: usually a solution of known...

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Unformatted text preview: 1 Titrant: usually a solution of known composition or concentration Analyate: usually a solution of unknown composition or concentration 2 4 6 8 10 12 10 20 30 Volume of Base Titrant Added (mL) pH Titration Curve pH Run 2 pH Run 1 pK a Half-Titration Stoichiometric Point A C B X Y pH Buffering Region ≈ pKa ± 1 Typical titration of Acetic acid (weak acid) analyate with NaOH (strong base) titrant 2 Titration: Mechanics of Calculations Titrate 100. mL of 0.181 M HOAc with 0.150 M KOH Examine pH at FOUR points: 1. Initial pH; 2. Any Intermediate point; 3. Half-Way point (“Half-Titration”); and 4. Stoichiometric point 3 Titration: Initial pH No base added yet; pH calculation as usual! HOAc(aq) + H 2 O(l) H 3 O + ( aq ) + OA c – ( aq ) I 0.181 M – – x – + x + x Eq. 0..181– x – x x K a = x ( ) x ( ) 0.181 ( ) = 1.8 ! 10 " 5 x = 1.80 ! 10 " 3 M pH = 2.74 Titration: Intermediate points Determine pH after 5.00 mL of KOH has been added: Since a reaction has occurred we must now calculate the...
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This test prep was uploaded on 04/08/2008 for the course CHEM 6BH taught by Professor Hoeger during the Winter '08 term at UCSD.

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Titration - 1 Titrant: usually a solution of known...

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