Chromotrope 2B, GR

Name: Chromotrope 2B, GR
Brand: Vaqora Chemicals
SKU: VQ-000534

About Chromotrope 2B, GR

Chromotrope 2B (CAS 548-80-1) is a biological stain offered by Vaqora Chemicals (AR grade). With the molecular formula C16H9N3Na2O10S2, it has a molar mass of 513.4 g/mol. The IUPAC name is disodium, 4,5-dihydroxy-3-[(4-nitrophenyl)diazenyl]naphthalene-2,7-disulfonate. Common synonyms include Acid Red 176 and Chromotrope Red 4B.

In its supplied form it is a dark green to greenish-brown to brown powder. Store sealed in a dry, well-ventilated location away from incompatible materials. It carries the GHS signal word “Warning” with 3 hazard statements. Review the Safety Data Sheet before use.

Typical applications include histology and cytology staining, microscopy, clinical laboratories and pharmaceutical synthesis. Our customers for this product work in academic and industrial research, diagnostics and biotechnology and textiles and dyeing.

We offer Chromotrope 2B in 5 g, 25 g, 1 kg and 4 x 25 kg packs with a batch-specific COA, and ship to customers worldwide.

Typical applications

Histology & cytology staining
Microscopy
Clinical laboratories
Pharmaceutical synthesis

Industries

Grade guides

Specifications & identifiers

Chemical identifiers
Product name	Chromotrope 2B, GR
Catalogue No.	VQ-000534
CAS Number	548-80-1
IUPAC name	disodium;4,5-dihydroxy-3-[(4-nitrophenyl)diazenyl]naphthalene-2,7-disulfonate
Molecular formula	C₁₆H₉N₃Na₂O₁₀S₂
Molecular weight	513.4 g/mol
Exact mass	512.9525
Grade	AR
HSN code	29420090
InChIKey	AXUUHWJXDWBCSG-UHFFFAOYSA-L
SMILES	C1=CC(=CC=C1N=NC2=C(C3=C(C=C(C=C3C=C2S(=O)(=O)[O-])S(=O)(=O)[O-])O)O)[N+](=O)[O-].[Na+].[Na+]
PubChem CID	68360

Physical properties
Physical form	Powder
Appearance	Dark green to greenish-brown to brown powder
H-bond donors / acceptors	2 / 12
TPSA	242 Å²
Synonyms	2-(4-Nitrophenylazo)chromotropic acid disodium salt, Acid Red 176, Chromotrope Red 4B, Khromotrop 2B, Naphtocard Fast Red 3B, C.I. Acid Red 176, C.I. Acid Red 176 (VAN), p-Nitrobenzeneazochromotropic acid sodium salt, 2,7-Naphthalenedisulfonic acid, 4,5-dihydroxy-3-((4-nitrophenyl)azo)-, disodium salt, C.I. Acid Red 176, disodium salt, PCR 2B, CR-2B

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, P264, P264 + P265, P271, P280, P302 + P352, P304 + P340, P305 + P351 + P338, P319, P321, P332 + P317, P337 + P317, P362 + P364, P403 + P233, P405, 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

Other grades of CAS 548-80-1

Chromotrope 2B

CAS: 548-80-1
Formula: C₁₆H₉N₃Na₂O₁₀S₂
MW: 513.4 g/mol

VQ-045601

Frequently asked questions

What is the CAS number of Chromotrope 2B, GR?

The CAS Registry Number of Chromotrope 2B, GR is 548-80-1. It is also known as 2-(4-Nitrophenylazo)chromotropic acid disodium salt, Acid Red 176, Chromotrope Red 4B.

What is the molecular formula and molecular weight of Chromotrope 2B, GR?

Chromotrope 2B, GR has the molecular formula C16H9N3Na2O10S2 and a molecular weight of 513.4 g/mol.

Which grade and pack sizes of Chromotrope 2B, GR can I order?

We supply Chromotrope 2B, GR in AR grade, in 5 g, 25 g, 1 kg, 4 x 25 kg packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Chromotrope 2B, GR?

Yes. Every lot of Chromotrope 2B, GR 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 Chromotrope 2B, GR be shipped internationally?

Yes. Chromotrope 2B, GR 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.