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HA and A- are just examples of an acid/base reaction, where HA is any acid and A- is its conjugate base. Know that Ka and Kb are the equilibrium constants for acids and bases respectively and that strong acids/bases do not have Ka/Kb because they dissociate completely.
If you are talking about the equation Ka= [H3O+][A-]/[HA] I don’t think it necessarily has to be memorized but if you just think about it like other problems with the equilibrium constant, K, it’s just products over reactants which you can tell from the reaction of the acid you are given.
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