Description

Hydroxy Naphthol Blue is a specialized organic dye and complexometric indicator used in analytical chemistry. Its primary value lies in its ability to provide a sharp, clear color change for the precise titration of metal ions, particularly calcium and magnesium. This compound is essential for laboratories and industries requiring accurate quantitative analysis, such as water treatment, pharmaceuticals, and chemical manufacturing. Hydroxy Naphthol Blue CAS NO 165660-27-5 offers high sensitivity and reliability in endpoint detection.

Application

• Complexometric Titration Indicator: Primary use as a visual indicator for the EDTA titration of calcium and magnesium ions in hard water analysis.
• Analytical Chemistry Reagent: Employed in quantitative analysis protocols in research, quality control, and industrial laboratories.
• Water Quality Testing: Used in kits and procedures to determine water hardness for environmental monitoring and treatment plant operations.
• Pharmaceutical Analysis: Potential application in the assay of APIs or excipients containing relevant metal ions.
• Dye Intermediate: Serves as a chemical precursor or intermediate in the synthesis of other more complex dyes and pigments.
• Educational Demonstrations: Used in academic settings to teach principles of complexometric titrations and analytical techniques.

Basic Information

Product Name	Hydroxy Naphthol Blue
CAS No.	165660-27-5
Molecular Formula	C20H11N2Na3O11S3
Molecular Weight	620.47 g/mol
Synonyms	Hydroxynaphthol Blue; 1-(2-Hydroxy-4-sulfo-1-naphthylazo)-2-hydroxy-3,6-naphthalenedisulfonic acid trisodium salt; Acid Blue 92; C.I. 13390; Calcon-3; NSC 403697; Eriochrome Blue SE; 2-Hydroxy-1-(2-hydroxy-4-sulfo-1-naphthylazo)naphthalene-3,6-disulfonic acid trisodium salt
EINECS	Contact for details

Quality Control

Our Hydroxy Naphthol Blue is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing to ensure high purity, consistent performance as an indicator, and compliance with relevant specifications. A comprehensive Certificate of Analysis (COA) detailing identity, purity, and impurity profiles is provided with every shipment to guarantee traceability and meet the stringent requirements of analytical and industrial applications.

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 away from incompatible materials. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided 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 %
Solubility (in Water)	Clear, blue solution
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm

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