Q.

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

answer is D.

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Detailed Solution

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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