1.

In which of the following mixed aqueous solutions pH=kea at equilibrium-

Answer»

(I) is correct
(II) is correct
(III) is correct
both (I) and (II) are correct

Solution :(I) `pH=pK_a+log((0.1xx100)/(0.1xx100))=pK_a`(acid buffer)
(II) `underset(10 mmol,5mmol)CH_3COOH+underset(10mmol 0)NaOHto underset(0 10mmol)CH_3COONa+underset(0 10mmol)H_2O`
`pH=1/2(pK_w+pKa+logc)`
or `pH1/2]14+pK_a+log((10)/(200))]`
`:.pHcancel=pK_a` (incorrect)


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