Question

In a typical conductometric titration of a strong acid with a weak base, the curve resembles 
(Conductance vs volume of base graphs as shown in the question) 

• A. A
• B. B
• C. C
• D. D

Hint:

Strong acid + weak base titration gives a sharp decrease first, then a slight rise in conductance.

Answer 1

The Correct Option is B

Step 1: Nature of species during titration.
A strong acid initially provides a high concentration of H$^+$ ions, giving high conductance. When a weak base is added, H$^+$ neutralizes to form the weak conjugate acid of the weak base, lowering conductance because the weak conjugate acid ionizes poorly.
Step 2: Change in conductance with added base.
Before the equivalence point, conductance drops sharply because highly mobile H$^+$ is removed. After the equivalence point, excess weak base (which ionizes partially) increases conductance only slightly—much less than a strong base would.
Step 3: Identifying the curve.
Thus, the correct graph must show: – A steep fall initially (due to loss of H$^+$).
– A slow rise after equivalence (weak base contributes ions slowly).
Graph (C) shows this exact pattern.