Ionic EquilibriumMedium
Question
A certain weak acid has a dissociation constant of 1.0 × 10-4. The equilibrium constant for its reaction with a strong base is :
Options
A.1.0 × 10-4
B.1.0 × 10-10
C.1.0 × 1010
D.1.0 × 1014
Solution
HA OH- ⇋ A- + H2O
Weak acid + strong base
Keq =
and [H2O] = Unity
∴ Keq =
..........(1)For dissociation of weak acid
HA ⇋ H+ + A-
Ka =
..........(2) 
Keq = Ka / Kw
= 1.0 × 1010
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