Question: Methyl orange is an azo dye used as an indicator in acid- base titrations. (It is yellow-orange above pH 4.5 and red below pH 3.)

Methyl orange is an azo dye used as an indicator in acid- base titrations. (It is yellow-orange above pH 4.5 and red below pH 3.) Show how it can be synthesized from p aminobenzenesulfonic acid (sulfanilic acid) and N,N-dimethylaniline.

(CH,)2N N-N SO3 methyl orange

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