Methyl orange is a widely used acid-base indicator in chemistry labs and titration experiments.
Methyl orange is an azo dye — its colour change occurs because the acidic/basic environment changes its molecular structure (resonance forms).
The transition range of methyl orange is pH 3.1 to 4.4.
Methyl orange is used as an indicator in Strong Acid vs Weak Base titrations (e.g., HCl titrated with NH₄OH). It is NOT suitable for strong base titrations because it changes colour in the acidic range only.
Litmus turns **red** in acid and **blue** in base — just like methyl orange turns red in acid.
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