Molekula
Methyl Orange 3.0 (red) - 4.4 (yellow)
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Methyl Orange is a synthetic pH indicator dye used in analytical chemistry to determine acidity or alkalinity, changing color from red (pH 3.0) to yellow (pH 4.4). It is widely applied in titrations, wastewater testing, and laboratory analysis. This product has a CAS number of 547-58-0, molecular formula C14H14N3NaO3S, and a molecular weight of 327.33 g/mol. Store at ambient conditions. Signal word: Danger. Molekula supplies Methyl Orange from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Orange/yellow powder |
| Residue on Ignition | 18.5% - 32.0% |
| Colour Change | 3.0 (red) - 4.4 (yellow) |
| Sensitivity Test | Pass |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 6.1 |
| Packing Group | III |
| Acidity | Acid |
Identification
| Property | Value |
|---|---|
| SKU | 90030758 |
| CAS Number | 547-58-0 |
| IUPAC Name | sodium 4-[[4-(dimethylamino)phenyl]diazenyl]benzenesulfonate |
| EC Number | 208-925-3 |
| Molecular Formula | C14H14N3NaO3S |
| Molecular Weight | 327.33 |
| Exact Mass | 327.0654 |
| SMILES | CN(C)C1=CC=C(C=C1)N=NC2=CC=C(C=C2)S(=O)(=O)[O-].[Na+] |
| InChIKey | STZCRXQWRGQSJD-UHFFFAOYSA-M |
| InChI | InChI=1S/C14H15N3O3S.Na/c1-17(2)13-7-3-11(4-8-13)15-16-12-5-9-14(10-6-12)21(18,19)20;/h3-10H,1-2H3,(H,18,19,20);/q;+1/p-1 |
| PubChem CID | 23673835 |
| UN Number | UN3143 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 29270030 |
| Tariff Code | 2927000090 |
Safety & GHS
-
Toxic
GHS06
Hazard statements
- H301 Toxic if swallowed
Precautionary statements
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician
- P302+352 IF ON SKIN: Wash with soap and water
- P304+341 IF INHALED: If breathing is difficult, remove victim to fresh air and keep at rest in a position comfortable for breathing
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- P331 Do NOT induce vomiting
Documents
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- Acid Orange 52
- C.I. 13025
- C.I. Acid Orange 52
- Eniamethyl Orange
- Gold Orange
- Helianthine
- Helianthine B
- METHYL ORANGE
- Orange III
- Tropaeolin D
Frequently asked questions
What is Methyl Orange primarily used for?
Methyl Orange is commonly used as a pH indicator in titrations, particularly for detecting the endpoint in acid-base titrations around pH 3.1 (red) to 4.4 (yellow).
What is the chemical formula and molecular weight of Methyl Orange?
The chemical formula is **C14H14N3NaO3S**, and the molecular weight is **327.33 g/mol**.
What is the hazard classification (Signal word) for Methyl Orange?
The Signal word for Methyl Orange is **Danger**, indicating significant hazards requiring careful handling.
How should Methyl Orange be stored?
Methyl Orange should be stored at **ambient temperature** in a dry, well-ventilated area, away from incompatible substances.
Can Molekula supply Methyl Orange in bulk quantities?
Yes, Molekula can supply Methyl Orange in bulk, with quantities tailored to your specific requirements—please contact us for details.
What documentation comes with an order of Methyl Orange?
Each order includes a **Certificate of Analysis (CoA)**, Material Safety Data Sheet (MSDS), and a product specification sheet for compliance and safety.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.