A compound 'X' is a weak acid and it exhibits colour change at pH close to the equivalence point during neutralization of NaOH with . Compound 'X' exists in ionized form in basic medium. The compound

Question

A compound 'X' is a weak acid and it exhibits colour change at pH close to the equivalence point during neutralization of NaOH with . Compound 'X' exists in ionized form in basic medium. The compound 'X' is

Canvas Classes · Accepted Answer

Step 1 — Identify the equivalence point pH:

For titration of  (weak acid) with NaOH (strong base):
- At equivalence point, only  is present
- pH at equivalence point ≈ 8.7–9 (basic)

Step 2 — Identify the indicator:

| Indicator | Type | pH range | Colour change |
|---|---|---|---|
| Methyl orange | Weak base | 3.1–4.4 | Red → Yellow |
| Methyl red | Weak acid | 4.4–6.2 | Red → Yellow |
| Phenolphthalein | Weak acid | 8.3–10 | Colourless → Pink |
| Erichrome Black T | Used in EDTA titrations |

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