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?

Question

Canvas Classes · Accepted Answer

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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