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Bronsted Lowry Theory

Conjugate aci...

Question

Conjugate acid of a weak base is always stronger. What will be the decreasing order of basic strength of the following conjugate bases ?
$O H^{-}, R O^{-}, C H_{3} C O O^{-}, C l^{-}$

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Solution

Conjugate acid of a weak base is always stronger and conjugate base of weak acid is always strong.
The weak acids are:
$\Rightarrow H_{2} O, R O H, C H_{3} C O O H, H C l$
$\Rightarrow H C l > C H_{3} C O O H > R O H > H_{2} O$
$\Rightarrow$ Conjugate base order $\Rightarrow O H^{-} > R O^{-} > C H_{3} C O O^{-} > C l^{-}$

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