100 mL of 0.1 M HCl is taken in a beaker and to it 100 mL 0.1 M NaOH is added in steps of 2 mL and the pH is…
Redox Reactions · Class 11 · JEE Main Previous Year Question
100 mL of 0.1 M HCl is taken in a beaker and to it 100 mL 0.1 M NaOH is added in steps of 2 mL and the pH is continuously measured. Which of the following graphs correctly depicts the change in pH?
- a
- b
- c✓
- d
Setup: 100 mL 0.1 M HCl in beaker; 0.1 M NaOH added in 2 mL steps.
Initial pH:
As NaOH is added (0–100 mL): HCl in excess, pH increases slowly from 1.
At equivalence point (100 mL NaOH): moles NaOH = moles HCl → pH = 7, sharp rise.
After equivalence (>100 mL): excess NaOH, pH levels off near 13.
The correct graph starts at pH ≈ 1, increases slowly, shows a sharp S-shaped jump at 100 mL NaOH, then levels off at high pH.
Answer: Option (3)
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