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Chp6_ABSummary - Summary of Aqueous Solutions of Weak...

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Summary of Aqueous Solutions of Weak Acid/Bases I. Weak Acid equilibrium: + - + + 1 3 1 2 O H A O H HA Corresponding reaction table equilibrium expression: x c x K a - = 0 2 Where x = [ H 3 O 1+ ] = [A 1- ] II. Weak Base equilibrium: - + + + 1 1 2 OH HB O H B Corresponding reaction table equilibrium expression: y c y K b - = 0 2 Where y = [ OH 1- ] = [ HB 1+ ] III. Problem Types (Given an aqueous solution of a weak acid/base): Type 1: Given Ka or Kb and C0 (or other means to determine them independently) and calculate x or y (or pH/pOH). Type 2: Given Ka & pH (or Kb and pH/pOH) – or other means to determine them – calculate C0 (or something related to C0, e.g. mass/vol/mols). Type 3: Given C0 and pH/pOH, determine Ka/Kb. In other words, fundamentally there are three possible unknowns and, thereby, three possible variants of given two, calculate the third. In terms of real-world application: Type 1: What pH results if one dumps in so much acid/base into so much water? E.g. “if so much of such-and-such pollutant is dumped into Lake N., how will the pH change?
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