For a polybasic acid, the dissociation constants have different value – InterviewSolution

1.	For a polybasic acid, the dissociation constants have different value for each steps, e.g., H3A⇌H++H2A−; K=Ka1 H2A−⇌H++HA2−; K=Ka2 HA2−⇌H++A3−; K=Ka3 What is the observed trend of dissociation constants in succesive stage?
Answer» For a polybasic acid, the dissociation constants have different value for each steps, e.g., $H_{3} A ⇌ H^{+} + H_{2} A^{-}; K = K_{a_{1}}$ $H_{2} A^{-} ⇌ H^{+} + H A^{2 -}; K = K_{a_{2}}$ $H A^{2 -} ⇌ H^{+} + A^{3 -}; K = K_{a_{3}}$ What is the observed trend of dissociation constants in succesive stage?

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