In base vs. acid titration, at the end point methyl orange is present as

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Methyl orange is an acid-base indicator that changes colour based on pH.

Step 1 — Structure of methyl orange:
- In acidic medium (pH < 3.1): exists as quinonoid form (red/pink colour)
- In basic medium (pH  4.4): exists as benzenoid form (yellow colour)

Step 2 — At end point of base vs. acid titration:
In a base vs. acid titration (base in burette, acid in flask), the end point is reached when the solution becomes slightly acidic (pH ≈ 3.1-4.4 for methyl orange).

At the end point, the solutio

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