Methylorange
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An orange crystalline dye that is the sodium salt of the azo compound of dimethylaniline and sulphanilic acid and is chiefly used as an acid–base indicator, changing from red to yellow-orange over a pH range of 3.1 to 4.4; (CH₃)₂ NC₆ H₄ N=NC₆ H₄ SO₃ Na.
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