Arsenazo III, GR indicator

Name: Arsenazo III, GR indicator
Brand: Vaqora Chemicals
SKU: VQ-000318

About Arsenazo III, GR indicator

Arsenazo III (CAS 1668-00-4) is an indicator offered by Vaqora Chemicals (AR grade) with a typical assay of ≥85%. With the molecular formula C22H18As2N4O14S2, it has a molar mass of 776.4 g/mol. The IUPAC name is 3,6-bis[(2-arsonophenyl)diazenyl]-4,5-dihydroxynaphthalene-2,7-disulfonic acid. It is also known as 2,7-Bis(2-arsonophenylazo)chromotropic acid or Arsenazo III sodium salt.

It is supplied as a grey to dark grey or black powder. Keep the container tightly sealed and store it in a cool, dry area. The GHS classification uses the signal word “Danger”, so appropriate gloves, eye protection and ventilation are recommended.

Key uses span titration end-point detection, pH determination and analytical testing. Typical end-use sectors are academic and industrial research.

We offer Arsenazo III in 1 g, 5 g, 25 g and 1 kg packs with a batch-specific COA, and ship to customers worldwide.

Typical applications

Titration end-point detection
pH determination
Analytical testing

Industries

Grade guides

Specifications & identifiers

Chemical identifiers
Product name	Arsenazo III, GR indicator
Catalogue No.	VQ-000318
CAS Number	1668-00-4
IUPAC name	3,6-bis[(2-arsonophenyl)diazenyl]-4,5-dihydroxynaphthalene-2,7-disulfonic acid
Molecular formula	C₂₂H₁₈As₂N₄O₁₄S₂
Molecular weight	776.4 g/mol
Exact mass	775.8693
Grade	AR
Purity / assay	≥85%
HSN code	29319090
InChIKey	UQHVTNUJRKELCE-UHFFFAOYSA-N
SMILES	C1=CC=C(C(=C1)N=NC2=C(C3=C(C(=C(C=C3C=C2S(=O)(=O)O)S(=O)(=O)O)N=NC4=CC=CC=C4[As](=O)(O)O)O)O)[As](=O)(O)O
PubChem CID	135445682

Physical properties
Physical form	Powder
Appearance	Grey to dark grey or black powder
H-bond donors / acceptors	8 / 18
TPSA	330 Å²
UN number	UN 3465
Synonyms	2,2′-(1,8-Dihydroxy-3,6-disulfonaphthylene-2,7-bisazo)bisbenzenearsonic acid, 2,7-Bis(2-arsonophenylazo)chromotropic acid, Arsenazo III sodium salt, 2,7-Bis(2-arsonophenylazo)-1,8-dihydroxy-3,6-naphthalenedisulfonic acid, Arsenazo cento, 3,6-bis((E)-(2-Arsonophenyl)diazenyl)-4,5-dihydroxynaphthalene-2,7-disulfonic acid, 2,7-Naphthalenedisulfonic acid, 3,6-bis[(2-arsonophenyl)azo]-4,5-dihydroxy-, Arsenazo-III, 3,6-Bis((2-arsonophenyl)diazenyl)-4,5-dihydroxynaphthalene-2,7-disulfonic acid, 2,7-Naphthalenedisulfonic acid, 3,6-bis((2-arsonophenyl)azo)-4,5-dihydroxy-, Arsenazo(III), 2,7-Bis(2-arsonophenylazo)-1,8-dihydroxynaphthalene-3,6-disulfonic Acid

Safety & hazard information (GHS)

Toxic

Environmental hazard

Signal word: Danger

Hazard statements

H301Toxic if swallowed
H331Toxic if inhaled
H410Very toxic to aquatic life with long lasting effects

Precautionary statements: P261, P273, P301 + P310, P311, P501

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

Frequently asked questions

What is the CAS number of Arsenazo III, GR indicator?

The CAS Registry Number of Arsenazo III, GR indicator is 1668-00-4. It is also known as 2,2′-(1,8-Dihydroxy-3,6-disulfonaphthylene-2,7-bisazo)bisbenzenearsonic acid, 2,7-Bis(2-arsonophenylazo)chromotropic acid, Arsenazo III sodium salt.

What is the molecular formula and molecular weight of Arsenazo III, GR indicator?

Arsenazo III, GR indicator has the molecular formula C22H18As2N4O14S2 and a molecular weight of 776.4 g/mol. Its IUPAC name is 3,6-bis[(2-arsonophenyl)diazenyl]-4,5-dihydroxynaphthalene-2,7-disulfonic acid.

Which grade and pack sizes of Arsenazo III, GR indicator can I order?

We supply Arsenazo III, GR indicator in AR (≥85%) grade, in 1 g, 5 g, 25 g, 1 kg packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Arsenazo III, GR indicator?

Yes. Every lot of Arsenazo III, GR indicator 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 Arsenazo III, GR indicator be shipped internationally?

Yes. Arsenazo III, GR indicator is classified as hazardous (UN 3465), 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.