Description

Chromate(1-), Bis[2,4-Dihydro-4-[(2-Hydroxy- 4-Nitrophenyl)Azo]-5-Methyl-3H-Pyrazol-3-Onato (2-)]-, Sodium is a high-purity, complex chromium azo dye salt, also known as Mordant Black 9. This compound is valued for its strong chelating properties and ability to form stable, deeply colored complexes with various metal ions. It is primarily utilized in analytical chemistry as a metallochromic indicator and in specialized industrial dyeing and pigment applications where precise color and metal interaction are critical.

Application

• Metallochromic Indicator: Used in complexometric titrations, particularly for the determination of calcium, magnesium, and other metal ions in analytical chemistry.
• Laboratory Reagent: Serves as a key component in the preparation of standardized testing solutions for water hardness analysis and other quantitative metal assays.
• Specialty Dye Intermediate: Employed in the synthesis of complex dyes and pigments requiring specific metal-complexing behavior.
• Histological Staining: Potential use in biological staining techniques for microscopy, where metal-dye complexes are used to highlight tissue structures.
• Teaching & Research: A standard reagent in educational and research laboratories for demonstrating principles of complexometric titration and colorimetry.

Basic Information

Product Name	Chromate(1-), Bis[2,4-Dihydro-4-[(2-Hydroxy- 4-Nitrophenyl)Azo]-5-Methyl-3H-Pyrazol-3-Onato (2-)]-, Sodium
CAS No.	75199-07-4
Molecular Formula	C32H18CrN10NaO10
Molecular Weight	777.53 g/mol
Synonyms	Mordant Black 9; Sodium Chromate Bis(4-[(2-Hydroxy-4-nitrophenyl)azo]-3-methyl-1H-pyrazol-5-olato); CI 14645; Eriochrome Blue Black R; Solochrome Dark Blue; Chromogen Black ET 00; Acid Chrome Blue Black; 1-Naphthol-4-sulfonic acid, 1-(2-hydroxy-4-nitrophenyl)azo]-2-naphthol chromium complex sodium salt
EINECS	Contact for details

Quality Control

Our Chromate(1-), Bis[2,4-Dihydro-4-[(2-Hydroxy- 4-Nitrophenyl)Azo]-5-Methyl-3H-Pyrazol-3-Onato (2-)]-, Sodium is manufactured under a strict quality management system. Each batch is analyzed to ensure it meets high-purity standards suitable for analytical and laboratory use. Key parameters including purity, heavy metal content, and loss on drying are verified. Certificates of Analysis (COA) are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive) and light-sensitive; containers must be kept tightly sealed after opening to minimize exposure to atmospheric moisture and light to maintain stability and performance.

Specification

Item	Specification
Appearance	Dark blue to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Heavy Metals (as Pb)	≤ 20 ppm
Chromium Content	Contact for details
Solubility (in Water)	Soluble, gives a clear solution

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.