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Ways of Representing the Concentration of a Solution

Calculate the...

Question

Calculate the $[O H^{-}]$ in $0.01 M$ aqueous solution of $N a O C N (K_{b}$ for $O C N^{-} = 10^{- 10})$

10^{- 6} M

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10^{- 7} M

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10^{- 8} M

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N o n e o f t h e s e

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Solution

The correct option is D $N o n e o f t h e s e$
As we know, for strong base-weak acid hydrolysis,

$p H = 7 + \frac{p K_{a}}{2} + \frac{l o g C}{2} = 7 + 2 + 2 = 11$

So, pOH is 3 and $[O H^{-}] = 10^{- 3}$

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