Description

Mordant Black 77 is a high-purity metallochromic indicator and complexometric dye widely used in analytical chemistry and industrial processes. Its primary value lies in its sharp color change at specific endpoints, making it a critical reagent for precise volumetric analysis, particularly in water hardness testing and metal ion titration. This product is essential for laboratories, chemical manufacturers, and water treatment facilities requiring reliable and consistent analytical results. It is supplied as a high-grade powder, ensuring optimal performance and batch-to-batch consistency for professional applications.

Application

• Complexometric Titration Indicator: Primary use as an indicator for the titration of calcium, magnesium, and other metal ions with EDTA.
• Water Hardness Analysis: Key component in standard test kits and laboratory methods for determining total water hardness.
• Metallurgical Analysis: Used in the quantitative analysis of metal ions in ores, alloys, and industrial process streams.
• Dyeing and Staining Agent: Employed as a biological stain and in specific textile dyeing processes as a mordant dye.
• Research & Development: Utilized in chemical research for developing new analytical methods and studying metal-ligand interactions.
• Quality Control Laboratories: Standard reagent for in-process checks and final product quality assurance in various chemical industries.

Basic Information

Product Name	Mordant Black 77
CAS No.	61725-27-7
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	262-932-4

Quality Control

Our Mordant Black 77 is manufactured under strict quality management systems to ensure it meets the high standards required for analytical applications. Each batch is tested for key parameters including identity, purity, and performance as a titration indicator. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical specifications is provided with every shipment to guarantee traceability and compliance.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after use to prevent absorption of atmospheric moisture, which can affect performance. Keep away from incompatible materials.

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 brown solution
Titration Performance	Sharp, clear color change at endpoint
Heavy Metals (as Pb)	≤ 20 ppm

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