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Determine the dergee of dissociation of ...

Determine the dergee of dissociation of `0.05 M NH_(3)` at `25^(@)C` in a solution of `pH = 11`.
`K_(b) = 1.77 xx 10^(-5) (pK_(b) = 4.75)`

Text Solution

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`{:(,NH_(4)OH hArr,NH_(4)^(o+)+,overset(Theta)OH,),(,1,0,0,),(,(1-alpha),alpha,alpha,):}`
Given, `pH = 11`
`:. [H^(o+)] = 10^(-11) :. [overset(Theta)OH] = 10^(-3) = C alpha`
Since `C = 0.05`
`:. alpha = (10^(-3))/(c) = (10^(-3))/(0.05) = 2xx 106(-2) or 2%`
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