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CAS: 547-58-0
Molecular Formula: C14H14N3NaO3S
Molecular Weight: 328.34
EINECS: 208-925-3
HS Code: 29270000
Synonyms: Stock Methyl Orange Solution; Sodium 4-(Dimethylamino)azobenzene-4′-sulfonate; S No 176; p-Dimethylaminoazobenzenesulfonic Acid Sodium Salt; p-[[p-(Dimethylamino)phenyl]azo]benzenesulfonic Acid, Sodium Salt; Tropaeolin D; CI No 13025; CI 13025
Methyl Orange (CAS 547-58-0) is an azo dye and acid-base indicator widely used in analytical chemistry. It appears as an orange-yellow powder and shows a clear color transition depending on the pH value of the solution.
Methyl Orange changes from red in acidic conditions to yellow in alkaline conditions, with a transition range of pH 3.1-4.4. Due to its sharp endpoint color change, it is commonly used for acid-base titration, especially for mineral acids and strong bases.
Besides its analytical applications, Methyl Orange is also used as a dye intermediate, textile dyeing agent, and functional material in scientific research.
| Property | Value |
| Appearance | Orange-yellow powder |
| Melting Point | 300 °C |
| Density | 0.987 g/mL at 25 °C |
| pH Range | 3.1 (Red) – 4.4 (Orange) |
| Solubility | Soluble in hot water; slightly soluble in cold water |
| Storage Conditions | Store at +5 °C to +30 °C |
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Our R&D laboratory, staffed by experienced chemists and engineers, drives continuous innovation— developing high-performance chemical solutions tailored to diverse industries. From raw material analysis to final product inspection, we maintain full traceability and consistency.
