Description

Mordant Black 13 is a high-purity metallochromic indicator and complexometric dye widely used in analytical chemistry. Its primary value lies in its sharp color change at specific endpoints, making it essential for precise volumetric analysis, particularly in water hardness determination. This product is critical for laboratories, water treatment facilities, and industrial quality control units that require reliable and accurate titration procedures. Mordant Black 13 CAS NO 1324-21-6 is supplied as a fine powder, ensuring consistent performance and solubility in standard applications.

Application

• Complexometric Titration Indicator: The primary application is as a metallochromic indicator for the titration of calcium, magnesium, and other metal ions with EDTA.
• Water Hardness Analysis: A key component in standard methods for determining total water hardness in environmental, industrial, and municipal water samples.
• Analytical Reagent: Used in the preparation of standardized solutions for educational, research, and industrial analytical laboratories.
• Dyeing and Staining: Employed in specific histological staining techniques and as a colorant in specialized industrial processes.
• Chelometric Studies: Utilized in research applications involving metal-chelate formation and stability constant determination.
• Quality Control Testing: Integral to QC protocols in pharmaceuticals, chemicals, and manufacturing where metal ion content must be precisely quantified.

Basic Information

Product Name	Mordant Black 13
CAS No.	1324-21-6
Molecular Formula	C20H12N3O7SNa
Molecular Weight	461.38 g/mol
Synonyms	Eriochrome Black T; Solochrome Black T; 3-Hydroxy-4-[(1-hydroxy-2-naphthyl)azo]-7-nitro-1-naphthalenesulfonic Acid Sodium Salt; Mordant Black 11; CI 14645; EDTA Titration Indicator; Calcon; Acid Chrome Black T
EINECS	215-374-5

Quality Control

Our Mordant Black 13 is manufactured under strict quality management systems to ensure batch-to-batch consistency and reliability for critical analytical applications. Each lot is tested to confirm identity, purity, and performance as a titration indicator. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and performance characteristics is provided with every shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Keep the container tightly sealed when not in use to protect against moisture absorption and contamination.

Specification

Item	Specification
Appearance	Dark brownish-black to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Solubility (in Water)	Clear, dark solution
Titration Performance	Sharp, clear endpoint transition
Heavy Metals (as Pb)	≤ 20 ppm

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