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In page Conjugate (acid-base theory):

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On the other hand, if a chemical is a weak acid its conjugate base will not necessarily be strong. Consider that ethanoate, the conjugate base of ethanoic acid, has a base splitting constant (Kb) of about 5.6×10−10, making it a weak base. In order for a species to have a strong conjugate base it has to be a very weak acid, like water.[citation needed]