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The hydrogen ion concentration in weak acid of dissociation constant Ka and concentration c is nearly equal to

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a
Ka/c
b
C/Ka
c
KaC
d
Kac
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detailed solution

Correct option is D

HA   ⇄  H3O+ + A-At equilibrium      C1-α    Cα           CαH3O+ = Cα   and Ka=Cα×CαC(1-α)=Cα2 ⇒ α=Kac  So H3O+ = C  Kac = Kac

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