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

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Ka/c

C/Ka

KaC

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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