Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryIonic Equilibria2 Marks
Question
Define and explain dissociation constant of a weak acid.
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Answer
Dissociation constant of a weak acid: It is defined as the equilibrium constant for dissociation equilibrium of a weak acid and denoted by $K _{ a }$. Explanation : Consider an aqueous solution of a weak acid HA. $HA _{( aq )} \rightleftharpoons H _{( aq )}^{+}+ A _{( aq )}^{-}$
The equilibrium constant called dissociation constant $Ka$ is represented as, $K _{ a }=\frac{\left[ H ^{+}\right] \times\left[ A ^{-}\right]}{[ HA ]}$
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