1.

What is acidity constant? How is it expressed.

Answer»

SOLUTION :(i) The dissociation constant is generally called acidity constant because it measures the RELATIVE strength of an acid. The STRONGER the acid, the large will be its `K_(a)` value.
(ii) The strength of carboxylic acid can be EXPRESSED in terms of the dissociation constant `(K_(a))`:
`R^(-)COOH+H_(2)OhArrRCOO^(-)+H_(3)O^(+)`
`K_(a)=([RCOO^(-)][H_(3)O^(+)])/([RCOOH])`
(III) The dissociation constant of an acid can also be expressed in terms of `p^(Ka)` value.
`p^(Ka)=-logK_(a)`


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