First slide

Ionization constants of weak bases, PH of weak bases

Question

$p^{H}$ of 0.1 M weak mono acidic base is 11. Dissociation constant of the base is

Easy

A

$10^{- 3}$
B

$10^{- 4}$
C

$10^{- 5}$
D

$10^{- 6}$

Solution

$p^{H} = 11; p^{OH} = 3; [{OH}^{-}] = 10^{- 3}; [{OH}^{-}] = \sqrt{c . K_{b}}; 10^{- 3} = \sqrt{10^{- 1} . K_{b}}; K_{b} = 10^{- 5};$

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