Lec22 - Last Time Salts Ions as acids conjugate acids of weak bases Ions as bases conjugate bases of weak acids Titrations Used to determine the

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1 Last Time •Sa l ts – Ions as acids – conjugate acids of weak bases – Ions as bases – conjugate bases of weak acids • Mixtures of salts and weak acids and bases – Salt modifies initial concentrations Titrations • Used to determine the amount of acid or base in a solution – pH vs. volume • Two components – analyte – what is being investigated – titrant – what is being varied • Four variations – strong acid/strong base and vice–versa – strong acid/weak base and vice–versa Titrations Continued • Stoichiometric point – when the number of moles of titrant equals the number of moles of analyte H 3 O + (aq) + OH (aq) 2H 2 O(l) • For strong acid/strong base titrations
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2 Strong Acid/Strong Base • For an acidic analyte – HA – below pH = 7, [H 3 O + ] > [OH ] – at pH = 7, [H 3 O + ] = [OH ] there is MA salt – above pH = 7, [H 3 O + ] < [OH ] • For a basic analyte – MOH – above pH = 7, [H
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This note was uploaded on 04/23/2008 for the course CHEM 2B taught by Professor Clemens during the Winter '08 term at UC Davis.

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Lec22 - Last Time Salts Ions as acids conjugate acids of weak bases Ions as bases conjugate bases of weak acids Titrations Used to determine the

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