Description

Ethyl Orange is a synthetic azo dye belonging to the class of acid-base indicators. This compound is valued for its distinct color change properties, making it a critical tool in analytical chemistry and research. It is primarily utilized by professionals in laboratory, educational, and industrial quality control settings for pH determination and as a staining agent in various protocols.

Application

• Acid-Base Titration Indicator: Used for visual endpoint detection in titrimetric analysis within specific pH ranges.
• Biological Staining: Employed in microscopy for staining cellular components and tissues in histological studies.
• Educational Demonstrations: Serves as a vivid teaching aid in chemistry classrooms to illustrate pH concepts and colorimetric reactions.
• Research & Development: Acts as a model compound in photochemical studies, dye chemistry research, and method development.
• Industrial Process Control: Applied in specific niche manufacturing processes for colorimetric monitoring.

Basic Information

Item	Detail
Product Name	Ethyl Orange
CAS No.	62758-12-7
Molecular Formula	C14H15N3O3S
Molecular Weight	305.35 g/mol
Synonyms	Ethyl Orange; Ethyl Orange Sodium Salt; Acid Orange 20; Tropaeolin D; 4-[(4-Diethylaminophenyl)diazenyl]benzenesulfonic Acid Sodium Salt; Sodium 4-[(4-Diethylaminophenyl)diazenyl]benzenesulfonate; C.I. 14645; Ethyl Orange Indicator
EINECS	263-847-5

Quality Control

Our Ethyl Orange is produced and tested to meet high-purity standards suitable for laboratory and analytical use. Each batch undergoes rigorous quality testing, including identity confirmation, purity assay, and impurity profiling. A Certificate of Analysis (COA) detailing specific results is available for every shipment to ensure traceability and compliance with your quality requirements.

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.

Specification

Item	Specification
Appearance	Orange to orange-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0%
pH (1% Solution)	To be specified per grade
Solubility	Soluble in water, ethanol
Transition Interval	~3.4 (red) to 4.8 (yellow)

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