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I think knowing the typical weak acid/weak base equilibrium equations are useful. As long as you know that HA + H20 => A- + H3O+ and A- + H2O => HA + OH- then you should be able to write the equations for a weak acid weak base problem.
In those instances in which you are not given a chemical equation, you need to use the context clues to generate an equation. Usually you will have to come up with the equations yourself only for Acid-Base equilibrium problems, in which the acid or base and water are almost always the reactants and their conjugate acid/conjugate base and hydronium/hydroxide are almost always the products.
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