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lec22 - Last Time Salts Ions as acids conjugate acids of...

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1 Last Time • Salts – 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 the stoichiometric point is pH = 7
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