Question

$C{H}_{3}COOH$ is titrated with NaOH solution. Which of the following statement is true?

• A. Conductance increases upto equivalence point, after which it decreases.
• B. Conductance decreases upto equivalence point, after which it increases.
• C. Conductance first increases (but not rapidly) upto equivalence point and then increases rapidly after equivalence point.
• D. none

Answer 1

Answer: (C)

Conductance first increases (but not rapidly) upto equivalence point and then increases rapidly after equivalence point.

Weak Acid along with a Strong Base, example for acetic acid with NaOH:
Initially the conductance is low because of the feeble ionization of acetic acid. At the addition of base, there is reducing within conductance not only because of the replacement of $H^{+}$ through $N{a}^{+}$ but also suppresses the dissociation of acetic acid due to general ion acetate.
But extremely soon, the conductance increases on adding NaOH as NaOH neutralizes the un-dissociated $C{H}_{3}COOH$ to $C{H}_{3}COONa$ that is the strong electrolyte. This rise in conductance continues raise up to the equivalence point. The graph near the equivalence point is curved because the hydrolysis of salt $C{H}_{3}COONa$. Beyond the equivalence point, conductance increases more rapidly along with the addition of NaOH because of the highly conducting OH- ions display in the below figure.