Given below are two statements:

Statement I: In the titration between strong acid and weak base, methyl orange is suitable as an indicator.
Statement II: For titration of acetic acid with NaOH, pheno

Question

Given below are two statements:

Statement I: In the titration between strong acid and weak base, methyl orange is suitable as an indicator.
Statement II: For titration of acetic acid with NaOH, phenolphthalein is not a suitable indicator.

Choose the correct option:

Canvas Classes · Accepted Answer

Step 1 — Evaluate Statement I:
For strong acid + weak base titration:
- Equivalence point pH < 7 (acidic)
- Methyl orange changes colour at pH 3.1–4.4  suitable for this titration ✓
Statement I is TRUE ✓

Step 2 — Evaluate Statement II:
For weak acid (acetic acid) + strong base (NaOH) titration:
- Equivalence point pH  7 (basic, ≈ 8.7)
- Phenolphthalein changes colour at pH 8.3–10  suitable for this titration
- Statement II says phenolphthalein is NOT suitable  Statement II is FALSE ✗

Answer: O

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