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Solution


Q.

Choose the correct representation of conductometric titration of benzoic acid vs sodium hydroxide.              [2023]
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Ans.

(3)

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 increases 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.