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What is dissociation constant of a weak ...

What is dissociation constant of a weak acid `(K_(a))`.

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Dissociation constant of a weak acid is the ratio of the product of molar concentrations of the products of ionisation to the molar concentration of the un-ionised acid medium. For a reaction
`HA+H_(2)OhArrH_(3)O^(+)+A^(-)`
`K_(a)=([H_(3)O^(+)][A^(-)])/([HA])`.
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