Description

Mordant Black 38 is a high-purity metallochromic indicator and complexometric dye belonging to the azo dye class. Its primary value lies in its exceptional chelating properties, forming stable, intensely colored complexes with various metal ions, which is critical for precise analytical determinations. This product is essential for industries and laboratories requiring accurate volumetric analysis, particularly in water hardness testing and as a specific indicator in EDTA titrations for calcium and magnesium.

Application

• Complexometric Titration Indicator: Primary use as a visual endpoint indicator in EDTA titrations for determining water hardness (calcium and magnesium ions).
• Analytical Chemistry Reagent: Used in standard laboratory methods for the quantitative analysis of metal ions in solution.
• Textile Dyeing (Mordant Dye): Employed in the dyeing of protein fibers like wool and silk, where it forms insoluble colored complexes with metal mordants such as chromium or aluminum.
• Metallurgical Analysis: Applied in the determination of specific metal concentrations in ores, alloys, and industrial process streams.
• Educational & Research Laboratories: Serves as a standard reagent in teaching analytical chemistry techniques and in research involving metal-ligand interactions.
• Quality Control Testing: Utilized in various industrial QC labs to monitor metal ion content in products like pharmaceuticals, chemicals, and boiler water.

Basic Information

Product Name	Mordant Black 38
CAS No.	6441-96-9
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 (C.I. 14645); EDTA Titration Indicator; Calcon; Water Hardness Indicator; CI 14645
EINECS	229-238-2

Quality Control

Our Mordant Black 38 is manufactured under strict quality management systems to ensure batch-to-batch consistency and high performance as an analytical reagent. Each lot undergoes comprehensive testing, including identification, purity assay, and suitability testing for its intended use as a titration indicator. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee compliance with your technical requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at controlled room temperature (15-25°C). Keep away from incompatible materials. The product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Dark brownish-black to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Suitability Test (as Indicator)	Passes test
Absorbance (Specific)	Meets internal standard
Heavy Metals (as Pb)	≤ 20 ppm
Solubility (in Water)	Clear, dark red-brown solution

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