lec23 - HA = n A – A – further accepts a proton from...

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1 Last Time • Titrations – analyte, titrant – Stoichiometric point Neutralization reactions – Strong acid/strong base – S point at pH = 7 – Strong acid/weak base – S point at pH < 7 – Weak acid/strong base – S point at pH > 7 Strong Acid/Weak Base Analyte – weak base : Titrant – strong acid B (aq) + H 3 O + (aq) HB(aq) + H 2 O(l) pH < 7 at the stoichiometric point – n H3O = initial n B = n HB – HB further donates a proton to water – calculate pH like the pH of a salt solution Above stoichiometric point pH calculation is like a weak base with a salt, below, [H 3 O + ]
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