Incorrect statement for the use of indicator in acid-base titration is:

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Canvas Classes · Accepted Answer

Indicator selection depends on the pH at the equivalence point:

Step 1 — Equivalence point pH for each titration:
- Strong acid + Strong base: pH = 7  both methyl orange and phenolphthalein work
- Strong acid + Weak base: pH < 7  methyl orange (pH 3.1–4.4) is suitable
- Weak acid + Strong base: pH  7  phenolphthalein (pH 8.3–10) is suitable
- Weak acid + Weak base: pH ≈ 7 (depends on Ka/Kb)  no sharp endpoint, so no indicator works well

Step 2 — Evaluate each option:
- (1) Methyl orange for we

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