Description

Mordant Black 56 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 metal ion endpoints, ensuring accurate and reliable titration results. This product is essential for laboratories and industrial quality control units performing complexometric titrations, particularly for determining water hardness and analyzing calcium and magnesium ions. It is a critical reagent for professionals in chemical analysis, water treatment, and manufacturing sectors requiring precise metal ion quantification.

Application

• Complexometric Titration Indicator: Primary use as a visual endpoint indicator for EDTA titrations of calcium, magnesium, and other metal ions.
• Water Hardness Analysis: Key component in standard methods for determining total hardness in water samples for environmental and industrial monitoring.
• Analytical Reagent: Used in the preparation of standardized solutions and test kits for chemical analysis in laboratory settings.
• Dyeing and Staining Agent: Employed in specific histological staining procedures and as a metallochrome in certain material science applications.
• Teaching and Research: Standard reagent in educational and research laboratories for teaching principles of complexometry and analytical chemistry.

Basic Information

Product Name	Mordant Black 56
CAS No.	5851-02-5
Molecular Formula	C20H12N3O7SNa
Molecular Weight	461.38 g/mol
Synonyms	Eriochrome Black T; Solochrome Black T; Chromogen Black ET; Mordant Black 11; C.I. 14645; 1-(1-Hydroxy-2-naphthylazo)-6-nitro-2-naphthol-4-sulfonic acid sodium salt; EDTA Titration Indicator
EINECS	227-474-5

Quality Control

Our Mordant Black 56 is manufactured under strict quality management systems to ensure batch-to-batch consistency and high performance. Each lot undergoes comprehensive analytical testing, including identity confirmation by IR spectroscopy, purity assay by titration, and verification of suitability as a titration indicator. A detailed Certificate of Analysis (COA) is provided with every shipment, documenting all critical quality parameters to support your compliance and documentation needs.

Storage

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

Specification

Item	Specification
Appearance	Dark brown to black powder
Identification (IR)	Conforms to structure
Assay (Titration)	≥ 95.0%
Loss on Drying	≤ 5.0%
Suitability as Indicator	Passes test
Solubility (in Water)	Clear, dark solution

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