a = 3
because before the addition of NaOH there will be only HA molecules.
because as soon as NaOH is added the H+ will react with the OH- of NaOH leaving behind A- which is the conjugate base of acid.
because at the equivalence point there will be no H+ and OH- ions and only A- will be there.
because after the equivalence point there will be only A- and excess OH- of base as all the H+ ions have been consumed.
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