Tropeolin OOO (Certified by the Biological Stain Commission), Dye content ≥90%
- CAS
- 633-96-5
- Formula
- C16H11N2NaO4S
- MW
- 350.3 g/mol
ZX-000422
Stains, Fluorescent Dyes & Histology Reagents
Acid orange II
MicroscopyAvailable on request
Order Acid orange II (CAS 633-96-5) online at Zemixal. Lab and bulk packs, batch COA, fast global delivery. Catalogue no. ZX-000447.
CAS number633-96-5
FormulaC16H11N2NaO4S
Molar mass350.3 g/mol
Physical formPowder
HS code32129090
InChIKeyCQPFMGBJSMSXLP-UHFFFAOYSA-M
IUPAC namesodium 4-[(2-hydroxynaphthalen-1-yl)diazenyl]benzenesulfonate
About Acid orange II
Acid orange II is part of the Zemixal stains, Fluorescent Dyes & Histology Reagents range. Key data (Microscopy): CAS 633-96-5, formula C16H11N2NaO4S and molar mass 350.3 g/mol. Expect orange powder.
Common uses in the lab and plant
- Histology & cytology staining
- Microscopy
- Clinical laboratories
- Biological staining
Handling and storage
Literature values: melting point 164 °C. Hazard communication follows GHS (Warning: H315, H319 and H335). Our SDS lists exposure controls and first-aid measures.
Available as 25 g, 100 g, 5 kg and 4 x 25 kg. Larger or split packs can be arranged. You receive a batch certificate of analysis and a 16-section SDS with each order. Request pricing online and we confirm availability, documentation and freight to your country.
Typical uses
- Histology & cytology staining
- Microscopy
- Clinical laboratories
- Biological staining
Applications
Specifications and identifiers
| Product name | Acid orange II |
|---|---|
| Catalogue number | ZX-000447 |
| CAS number | 633-96-5 |
| IUPAC name | sodium 4-[(2-hydroxynaphthalen-1-yl)diazenyl]benzenesulfonate |
| Molecular formula | C16H11N2NaO4S |
| Molar mass | 350.3 g/mol |
| Exact mass | 350.0337 |
| Grade | Microscopy |
| Physical form | Powder |
| Appearance | Orange powder |
| Melting point | 164 °C |
| H-bond donors / acceptors | 1 / 6 |
| Topological polar surface area | 111 Ų |
| HS code | 32129090 |
| InChIKey | CQPFMGBJSMSXLP-UHFFFAOYSA-M |
| SMILES | C1=CC=C2C(=C1)C=CC(=C2N=NC3=CC=C(C=C3)S(=O)(=O)[O-])O.[Na+] |
| PubChem CID | 135442941 |
| Synonyms | 4-(2-Hydroxy-1-naphthylazo)benzenesulfonic acid sodium salt, Acid Orange A, Acid Orange 7, Orange II, Tropaeolin 000 No. 2, C.I. Acid Orange 7, 2-naphthol orange, 4-((2-Hydroxy-1-naphthalenyl)azo)benzenesulfonic acid monosodium salt, beta-naphthol orange, AO-7 dye, Acid Orange, Orange II sodium salt |
Lot values are stated on the batch certificate of analysis. Ask for a typical COA with your quotation.
Safety and GHS hazards
Signal word Warning
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements P261, P305 + P351 + P338
Classification summarised from public GHS notifications. It can vary with grade and concentration, so always follow the SDS supplied with your lot.
Pack sizes
| 25 g | Quoted on request | |
| 100 g | Quoted on request | |
| 5 kg | Quoted on request | |
| 4 x 25 kg | Quoted on request |
Need a different size? Bulk drums and custom packing are quoted on request through the quote form on this page.
Questions about Acid orange II
Which CAS number identifies Acid orange II?
Acid orange II is registered under CAS 633-96-5. You may also see it listed as 4-(2-Hydroxy-1-naphthylazo)benzenesulfonic acid sodium salt, Acid Orange A, Acid Orange 7. Our catalogue number for this item is ZX-000447.
What are the formula and molar mass of Acid orange II?
For Acid orange II, its formula is C16H11N2NaO4S and its molar mass is 350.3 g/mol. The systematic (IUPAC) name is sodium 4-[(2-hydroxynaphthalen-1-yl)diazenyl]benzenesulfonate. InChIKey CQPFMGBJSMSXLP-UHFFFAOYSA-M lets you match it in any structure database.
What grade and pack sizes are available for Acid orange II?
This listing is Microscopy grade. Standard packs are 25 g, 100 g, 5 kg, 4 x 25 kg. Larger quantities and custom packing can be quoted on request.
Which documents come with Acid orange II?
Each lot ships with a batch certificate of analysis and a 16-section GHS safety data sheet. A typical COA or specification sheet can be shared with the quotation before you order.
Can Zemixal ship Acid orange II to my country?
Yes. Because Acid orange II is classed as hazardous, it travels in UN-approved packaging as dangerous goods under IATA or IMDG rules, with the export paperwork your broker needs.
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