Question

Identify the correct conductometric titration curve for benzoic acid and NaOH titration.

Answer 1

Correct option is (4)

C₆H₅COOH + NaOH → C₆H₅COONa + H₂O

• The conductance first drops rapidly due to loss of more conducting H⁺ already in the solution.
• However soon, due to common ion effect of C₆H₅COO^-, the free H⁺ concentration in solution is almost negligible, and then the added NaOH only increase the number of ions by forming more of C₆H₅COONa.
• At the end point, the conductance rises much more rapidly due to addition of OH which has higher conductivity.