A) the cone. of both \[O{{H}^{-}}\] and \[C{{H}_{3}}CO{{O}^{-}}\]increases
B) the cone. of \[C{{H}_{3}}CO{{O}^{-}}\] decreases
C) the cone. of \[C{{H}_{3}}CO{{O}^{-}}\] increases
D) dissociation of \[C{{H}_{3}}COONa\] increases
Correct Answer: B
Solution :
Key Idea The decrease in the ionisation of a weak electrolyte by the presence of a common-ion from a strong electrolyte is called the common-ion effect. When NaOH is added to a solution of\[C{{H}_{3}}COONa\], then the ionisation of \[C{{H}_{3}}COONa\] is decreased due to the presence of common ion. (\[N{{a}^{+}}\] being the common ion). \[C{{H}_{3}}COONaC{{H}_{3}}CO{{O}^{-}}+N{{a}^{+}}\] ... \[NaOHO{{H}^{-}}+\,\,\,\,\underset{common-ion}{\mathop{N{{a}^{+}}}}\,\] In the presence of \[N{{a}^{+}}\] equilibrium shifts in backward direction. Therefore, the cone. of\[C{{H}_{3}}CO{{O}^{-}}\] decreases.
You need to login to perform this action.
You will be redirected in
3 sec
