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Question

Calculate the H+ ion concentration of a 0.01N weak monobasic acid. The value of dissociation constant is 4.0×1010.

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Solution

HAH++A
According to ostwald's dilution law for weak monobasic acid
Ka=Cα2
It is given that Ka=4.0×1010,C=0.01
So, α=KaC=2×104.
Concentration of Hydrogen ion =Cα=2×106mol/l

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