Tropeolin OOO (Certified by the Biological St… 633-96-5

Name: Tropeolin OOO (Certified by the Biological Stain Commission), Dye content ≥90%
Brand: Vaqora Chemicals
SKU: VQ-000422

About Tropeolin OOO (Certified by the Biological Stain Commission), Dye content ≥90%

Tropeolin OOO (Certified by the Biological Stain Commission) (CAS 633-96-5) is an indicator offered by Vaqora Chemicals with a typical assay of ≥90%. With the molecular formula C16H11N2NaO4S, it has a molar mass of 350.3 g/mol. Systematically, it is named sodium 4-[(2-hydroxynaphthalen-1-yl)diazenyl]benzenesulfonate. It is also known as Acid Orange A or Acid Orange 7.

In its supplied form it is an orange powder. Store in a tightly closed container in a cool, dry and well-ventilated place. Under GHS it is labelled “Warning”, so handle it with suitable PPE and consult the SDS.

Key uses span titration end-point detection, pH determination and analytical testing. Buyers come mainly from academic and industrial research and textiles and dyeing.

Standard pack sizes are 25 g, 100 g and 1 kg, and every batch ships with a Certificate of Analysis (COA) and we export worldwide.

Typical applications

Titration end-point detection
pH determination
Analytical testing

Industries

Specifications & identifiers

Chemical identifiers
Product name	Tropeolin OOO (Certified by the Biological Stain Commission), Dye content ≥90%
Catalogue No.	VQ-000422
CAS Number	633-96-5
IUPAC name	sodium 4-[(2-hydroxynaphthalen-1-yl)diazenyl]benzenesulfonate
Molecular formula	C₁₆H₁₁N₂NaO₄S
Molecular weight	350.3 g/mol
Exact mass	350.0337
Purity / assay	≥90%
HSN 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

Physical properties
Physical form	Powder
Appearance	Orange powder
H-bond donors / acceptors	1 / 6
TPSA	111 Å²
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

Safety & hazard information (GHS)

Harmful / irritant

Signal word: Warning

Hazard statements

H315Causes skin irritation
H319Causes serious eye irritation
H335May cause respiratory irritation

Precautionary statements: P261, P305 + P351 + P338

Classification is indicative (aggregated GHS notifications) and may vary by grade and concentration. Always refer to the SDS supplied with your lot.

Documents

Safety Data Sheet (SDS)16-section GHS · on request Certificate of AnalysisTypical / batch COA · on request Specification sheetTDS / MOA · on request

Other grades of CAS 633-96-5

Microscopy

Acid orange II

CAS: 633-96-5
Formula: C₁₆H₁₁N₂NaO₄S
MW: 350.3 g/mol

VQ-000447

Tropeolin OOO, indicator

CAS: 633-96-5
Formula: C₁₆H₁₁N₂NaO₄S
MW: 350.3 g/mol

VQ-000423

Frequently asked questions

What is the CAS number of Tropeolin OOO (Certified by the Biological Stain Commission), Dye content ≥90%?

The CAS Registry Number of Tropeolin OOO (Certified by the Biological Stain Commission), Dye content ≥90% is 633-96-5. It is also known as 4-(2-Hydroxy-1-naphthylazo)benzenesulfonic acid sodium salt, Acid Orange A, Acid Orange 7.

What is the molecular formula and molecular weight of Tropeolin OOO (Certified by the Biological Stain Commission), Dye content ≥90%?

Tropeolin OOO (Certified by the Biological Stain Commission), Dye content ≥90% has the molecular formula C16H11N2NaO4S and a molecular weight of 350.3 g/mol. Its IUPAC name is sodium 4-[(2-hydroxynaphthalen-1-yl)diazenyl]benzenesulfonate.

Which grade and pack sizes of Tropeolin OOO (Certified by the Biological Stain Commission), Dye content ≥90% can I order?

We supply Tropeolin OOO (Certified by the Biological Stain Commission), Dye content ≥90% in (≥90%) grade, in 25 g, 100 g, 1 kg packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Tropeolin OOO (Certified by the Biological Stain Commission), Dye content ≥90%?

Yes. Every lot of Tropeolin OOO (Certified by the Biological Stain Commission), Dye content ≥90% is shipped with a batch-specific Certificate of Analysis, and a 16-section GHS Safety Data Sheet is provided with the quotation and the shipment.

Can Tropeolin OOO (Certified by the Biological Stain Commission), Dye content ≥90% be shipped internationally?

Yes. Tropeolin OOO (Certified by the Biological Stain Commission), Dye content ≥90% is classified as hazardous, so it is packed in UN-approved packaging and shipped as dangerous goods under IATA/IMDG rules. We export worldwide on EXW, FOB, CIF and DAP terms.