Grade 12Physical Chemistry
a weak acid has dissociation constant 10-5
what is its equilibrium cinstant with strong base?
a weak acid has dissociation constant 10-5
what is its equilibrium cinstant with strong base?
1 Answer
Ramesh V
There exists a relationship between the value of Ka for an acid HA and the value of Kb for its conjugate base A–. Since adding the ionization reaction for HA and the ionization reaction of A– always gives the reaction for the self-ionization of water, the product of the acidity and basicity constants gives the dissociation constant of water (Kw), which is 1.0 × 10-14 M2 at 25°C. In other words,
Ka*Kb = Kw
kb = 10-14 / 10-5
= 10-9
--
regards
ramesh
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