Acid chrome blue K-Naphthol Green B indicator(K-B) - indicator , CAS No.3270-25-5

CAS: 3270-25-5 Cat. No.: A299397 Molecular Weight: 586.41
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GRADE & PURITY Indicator ? Indicator grade — characterized dye giving a defined color change at a known transition. Use to signal pH or titration endpoints visually.
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100ml
A299397-100ml
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Why this grade

indicator Indicator for sensitive chromatographic and analytical workflows requiring minimal baseline interference.

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Storage & shipping

Room temperature Ships Normal Check lot-specific COA for exact specifications.

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Quality documents

SDS, COA, datasheet, and spec sheet available for download. Lot-specific COA accessible via lot number lookup.

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Literature proof

Cited in 10 peer-reviewed publications across chromatography, organic synthesis, and cross-coupling reactions.

Specifications

Specifications & Purity
indicator
Storage
Room temperature
Shipped In
Normal
Grade
Indicator
Names and Identifiers
Pubchem Sid504773409
Pubchem Sid Urlhttps://pubchem.ncbi.nlm.nih.gov/substance/504773409
Canonical SmilesC1=CC(=C(C=C1S(=O)(=O)[O-])N=NC2=C(C3=C(C=C(C=C3C=C2S(=O)(=O)[O-])S(=O)(=O)[O-])O)O)O.[Na+].[Na+].[Na+]
IUPAC Nametrisodium;4,5-dihydroxy-3-[(2-hydroxy-5-sulfonatophenyl)diazenyl]naphthalene-2,7-disulfonate
InChIKeyXHCCWBJFZUXJBV-UHFFFAOYSA-K
INCHI1S/C16H12N2O12S3.3Na/c19-11-2-1-8(31(22,23)24)5-10(11)17-18-15-13(33(28,29)30)4-7-3-9(32(25,26)27)6-12(20)14(7)16(15)21;;;/h1-6,19-21H,(H,22,23,24)(H,25,26,27)(H,28,29,30);;;/q;3*+1/p-3
Molecular Weight 586.41
Reaxy-Rn 4112826
Reaxys-RN_link_address https://www.reaxys.com/reaxys/secured/hopinto.do?context=S&query=IDE.XRN=4112826&ln=

Documentation

📋 Safety Data Sheet (SDS)

Comprehensive hazard, handling, storage, and regulatory compliance document.

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✅ Certificate of Analysis (COA)

Lot-specific quality data. Enter your lot number to retrieve the exact COA.

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📊 Datasheet

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🔬 Specification Sheet

Full quality attributes and acceptance criteria for this grade.

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Advanced Data

Taxonomic Classification

Taxonomy Tree

KingdomOrganic compounds
SuperclassBenzenoids
ClassNaphthalenes
SubclassNaphthalene sulfonic acids and derivatives
Intermediate Tree Nodes Naphthalene sulfonates
Direct Parent2-naphthalene sulfonates
Alternative Parents 2-naphthalene sulfonic acids and derivatives  Benzenesulfonic acids and derivatives  Benzenesulfonyl compounds  1-sulfo,2-unsubstituted aromatic compounds  Phenoxides  Sulfonyls  Organosulfonic acids  Azo compounds  Propargyl-type 1,3-dipolar organic compounds  Organooxygen compounds  Organic sodium salts  Organic oxides  Hydrocarbon derivatives  Organic cations  
Molecular FrameworkAromatic homopolycyclic compounds
Substituents 2-naphthalene sulfonate - 2-naphthalene sulfonic acid or derivatives - Benzenesulfonate - Arylsulfonic acid or derivatives - Benzenesulfonyl group - 1-sulfo,2-unsubstituted aromatic compound - Phenoxide - Monocyclic benzene moiety - Organic sulfonic acid or derivatives - Organosulfonic acid or derivatives - Organosulfonic acid - Sulfonyl - Azo compound - Organic alkali metal salt - Organic 1,3-dipolar compound - Propargyl-type 1,3-dipolar organic compound - Organic nitrogen compound - Organic oxygen compound - Organic salt - Organic sodium salt - Hydrocarbon derivative - Organosulfur compound - Organooxygen compound - Organonitrogen compound - Organic oxide - Organic cation - Aromatic homopolycyclic compound
DescriptionThis compound belongs to the class of organic compounds known as 2-naphthalene sulfonates. These are organic aromatic compounds that contain a naphthalene moiety that carries a sulfonic acid group at the 2-position. Naphthalene is a bicyclic compound that is made up of two fused benzene ring.
External Descriptors Not available
3D Structure
Interactive Chemical Structure Model





Certificates(CoA,COO,BSE/TSE and Analysis Chart)
C of A & Other Certificates(BSE/TSE, COO):
Analytical Chart:

Find and download the COA for your product by matching the lot number on the packaging.

4 results found

Lot NumberCertificate TypeDateItem
C2616477Certificate of AnalysisMar 10, 2026 A299397
J2312009Certificate of AnalysisSep 19, 2025 A299397
I2205374Certificate of AnalysisJun 21, 2024 A299397
B2306878Certificate of AnalysisFeb 08, 2023 A299397
Chemical and Physical Properties
Molecular Weight586.400 g/mol
XLogP3
Hydrogen Bond Donor Count3
Hydrogen Bond Acceptor Count14
Rotatable Bond Count2
Exact Mass585.901 Da
Monoisotopic Mass585.901 Da
Topological Polar Surface Area282.000 Ų
Heavy Atom Count36
Formal Charge0
Complexity1020.000
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
The total count of all stereochemical bonds0
Covalently-Bonded Unit Count4
Documents & Articles
Citations of This Product
References
1. Xiaolei Wang, Shurui Han, Yaxian Xue, Bing Zhang, Huan Zhang, Huicai Wang, Jing Feng, Junfu Wei.  (2023)  Fabrication of anti-fouling polyester nanofiltration membrane for dye desalination.  Journal of Water Process Engineering,      [PMID:] [10.1016/j.jwpe.2023.104682]
2. Chao Wu, Xiaoping Wang, Tongren Zhu, Pan Li, Shengji Xia.  (2020)  Covalent organic frameworks embedded membrane via acetic-acid-catalyzed interfacial polymerization for dyes separation: Enhanced permeability and selectivity.  CHEMOSPHERE,      [PMID:32736241] [10.1016/j.chemosphere.2020.127580]
3. Yuanqing Luo, Xiaoyong Zhao, Pengfei Cai, Yuanjiang Pan.  (2020)  One-pot synthesis of an anionic cyclodextrin-stabilized bifunctional gold nanoparticles for visual chiral sensing and catalytic reduction.  CARBOHYDRATE POLYMERS,      [PMID:32241398] [10.1016/j.carbpol.2020.116127]
4. Huihui Zhang, Wenqing Shao, Shanshan Qiu, Jun Wang, Zhenbo Wei.  (2020)  Collaborative Analysis on the Marked Ages of Rice Wines by Electronic Tongue and Nose based on Different Feature Data Sets.  SENSORS,  20  (4): (1065).  [PMID:32075334] [10.3390/s20041065]
5. Jinyi Zhang, Jing Zuo, Yinshan Jiang, Dandan Zhu, Jiupeng Zhang, Cundi Wei.  (2019)  Kinetic analysis on the mesoporous formation of coal gasification slag by acid leaching and its thermal stability.  SOLID STATE SCIENCES,      [PMID:] [10.1016/j.solidstatesciences.2019.106084]
6. Fan Hu, Zhanghui Wang, Baoku Zhu, Liping Zhu, Youyi Xu.  (2018)  Poly (N-vinyl imidazole) gel-filled membrane adsorbers for highly efficient removal of dyes from water.  JOURNAL OF CHROMATOGRAPHY A,      [PMID:29886000] [10.1016/j.chroma.2018.05.075]
7. Zhenbo Wei, Yanan Yang, Luyi Zhu, Weilin Zhang, Jun Wang.  (2018)  Application of novel nanocomposite-modified electrodes for identifying rice wines of different brands.  RSC Advances,  (24): (13333-13343).  [PMID:35542510] [10.1039/C8RA00164B]
8. Jinyun Peng, Keliang Nong, Lingping Cen.  (2012)  Electropolymerization of Acid Chrome Blue K on Glassy Carbon Electrode for the Determination of Curcumin.  JOURNAL OF THE CHINESE CHEMICAL SOCIETY,  59  (11): (1415-1420).  [PMID:] [10.1002/jccs.201200085]
9. Zhiyun Kong, Bing Zhang, Xiaolei Wang, Zifei Qi, Chan Huang, Haike Li, Huan Zhang, Huicai Wang.  (2024)  Gel composite membrane with tannic acid/ferric ion separation layer for organic solvent nanofiltration.  JOURNAL OF MEMBRANE SCIENCE,      [PMID:] [10.1016/j.memsci.2024.123492]
10. Haike Li, Zhiyun Kong, Huan Zhang, Xiaolei Wang, Xin Wei, Ruichao Yang, Xueyi Zhang.  (2025)  HKUST-1 bridged calcium alginate gel nanofiltration membrane for separating drugs from organic solvents.  SEPARATION AND PURIFICATION TECHNOLOGY,      [PMID:] [10.1016/j.seppur.2025.132198]
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