Choose the correct representation of conductometric titration of benzoic acid vs sodium hydroxide (A — JEE Mains Chemistry Past Papers Chemistry Question

💡 Solution & Explanation

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.