In an acid-base titration, 0.1 M HCl solution was added to the NaOH solution of unknown strength. Which of the following correctly shows the change of pH of the titration mixture in this experiment?

Question

Canvas Classes · Accepted Answer

Step 1 — Identify the titration:
Strong acid (HCl) added to strong base (NaOH).

Step 2 — Expected pH curve:
- Initially: NaOH solution  high pH (≈ 12-13)
- As HCl is added: pH decreases gradually
- Near equivalence point: pH drops sharply (from ≈ 10 to ≈ 4)
- After equivalence point: excess HCl  pH levels off at low value (≈ 1-2)

Step 3 — Correct graph:
The correct graph shows:
- Start at high pH
- Gradual decrease
- Sharp drop at equivalence point
- Levels off at low pH

This is the classic s

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