Bromocresol Purple (0.04% in Water) [for pH Determination] TCI B0115

Chemical Identity

CAS No.: 115-40-2
PubChem: CID 8273·SID 87563313
Formula: C21H16Br2O5S
Molecular weight: 540.2 g/mol
Reference databases: ChEBI·ChemSpider·ECHA·Wikipedia

Full identifiers (IUPAC, SMILES, InChIKey)

IUPAC: 2-bromo-4-[3-(3-bromo-4-hydroxy-5-methylphenyl)-1,1-dioxo-2,1lambda6-benzoxathiol-3-yl]-6-methylphenol
SMILES: CC1=CC(=CC(=C1O)Br)C2(C3=CC=CC=C3S(=O)(=O)O2)C4=CC(=C(C(=C4)C)O)Br
InChIKey: ABIUHPWEYMSGSR-UHFFFAOYSA-N

Rp 900.900,00

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Volume 500mL

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Bromocresol Purple is a widely used pH indicator in laboratories for determining the acidity or alkalinity of a solution. It is commonly employed in analytical chemistry to provide visual feedback on pH changes, making it an essential tool for accurate and efficient pH measurements. This reagent is available in a 0.04% aqueous solution, which ensures consistent performance across various experimental setups. Its role is critical in both qualitative and quantitative analysis, particularly in titration processes where precise endpoint detection is required.

The key properties that make Bromocresol Purple a preferred choice include its sensitivity to pH changes and a well-defined color transition range. It changes color from purple to yellow as the pH increases from 5.2 to 6.8, offering a clear visual indication of pH shifts. This makes it highly reliable for applications requiring accurate and reproducible results. Additionally, its stability under proper storage conditions ensures long-term usability without degradation, maintaining its effectiveness over time.

In Indonesian laboratories, Bromocresol Purple is commonly used in educational and research settings. It is particularly favored for its simplicity and reliability in pH determination, supporting both basic and advanced analytical tasks. Its application is widespread in environmental, industrial, and academic laboratories, where accurate pH measurement is crucial for data integrity and experimental success.

TCI brochures (PDF)

Titration Reagents and TLC Stains 2026-05-07 · p. 3

Related TCI products

pH Titration Analysis: Bromocresol Purple is ideal for acid-base titrations due to its distinct color change range, helping to identify the endpoint accurately.
Environmental Sample Testing: Used in water and soil analysis to assess pH levels, ensuring compliance with environmental standards.
Educational Laboratories: Widely adopted in teaching labs for demonstrating pH measurement techniques and colorimetric responses.
Industrial Quality Control: Applied in manufacturing processes to monitor and maintain optimal pH levels in chemical processes.
Research and Development: Utilized in R&D settings for pH-sensitive experiments requiring precise and reliable indicators.

Brand	TCI
CAS number	115-40-2
Molecular formula	—
Purity	—
Category	Analytical Chemistry > Analytical Reagents > pH Measurement Reagents
Pack sizes	0.04% in Water (various sizes available)
Physical form	Aqueous solution
Storage	Store in a cool, dark place away from direct sunlight and moisture

Bromocresol Purple should be stored in a cool, dark place to prevent degradation and maintain its effectiveness. It is recommended to keep the solution in a tightly sealed container to avoid contamination and evaporation. The reagent is sensitive to light and moisture, so exposure to these elements should be minimized. Proper labeling of containers is essential for safe handling and identification. In laboratory settings, it is important to use appropriate personal protective equipment when handling the reagent. Regular inspection of storage conditions ensures the reagent remains stable and suitable for use in analytical processes.

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