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Methyl yellow

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Methyl yellow is a chemical compound which may be used as a pH indicator.

Methyl yellow's molecular formula is C14H15N3. Its formal name is p-dimethylaminoazobenzene.

In aqueous solution at low pH, methyl yellow appears red. Between pH 2.9 and 4.0, methyl yellow undergoes a transition, to become yellow above pH 4.0.

Additional indicators are listed in the article on pH indicators.