C16H13Cl2N5O3S
426.3 g/mol
Dye & PigmentWarning
4-[(5-amino-3-methyl-1-phenyl-1h-pyrazol-4-yl)azo]-2,5-dichlorobenzenesulphonic acid
CAS12239-15-5EC235-473-4
Category
Dye & Pigment
Compound Class
Heterocycle
Primary Use
acid dye for textiles
Methyl orange is a synthetic azo dye commonly used as a pH indicator in acid-base titrations, where it exhibits a distinct color change from red in acidic conditions to yellow in alkaline conditions.
pH indicator for titrationacid dye for textiles
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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CAS 12239-15-5
Related Compounds
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Acid Blue 161
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acid dye for textiles
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Acid Yellow 151
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acid dye for textiles
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Acid Green 16
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acid dye for textiles
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Acid Black 234
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acid dye for textiles
ReferenceSame Category
Reactive Violet 1
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reactive dye for textiles
ReferenceSame Category
Pigment Blue 15:2
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Pigment for plastics and coatings
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Thioketone dye intermediate
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Calcium bis{4-[(E)-(1-anilino-1,3-dioxo-2-butanyl)diazenyl]-3-nitrobenzenesulfonate}
CAS12286-65-6
yellow pigment for inks and coatings
Safety Reference
Warning
H302Harmful if swallowed
H319Causes serious eye irritation
Identifiers
IUPAC Name
4-[(5-amino-3-methyl-1-phenylpyrazol-4-yl)diazenyl]-2,5-dichlorobenzenesulfonic acid
InChIKey
QHVBDWZOQBMLLW-UHFFFAOYSA-N
SMILES
CC1=NN(C(=C1N=NC2=CC(=C(C=C2Cl)S(=O)(=O)O)Cl)N)C3=CC=CC=C3
Synonyms (12)
- ACID YELLOW 49
- C.I. ACID YELLOW 49