Description
Bromcresol purple is a pH indicator dye supplied in p.a., ACS quality for analytical laboratory work. It carries CAS number 115-40-2, EG number 204-087-8, empirical formula C₂₁H₁₆Br₂O₅S and a molar mass of 540,24 g/mol. This sulfonephthalein compound is widely used in titrimetric and colorimetric pH determination, buffer systems and related analytical procedures where a clear colour transition is required. The material is Offered from manufacturer Carl ROTH, the product fits routine quality-control, teaching and research environments that specify ACS-grade reagents. Its defined molecular identity and analytical grade make it suitable for preparing indicator solutions and for method development in aqueous systems. Categories of use include analytical chemicals and pH indicators, where reproducible colour response and documented composition are essential for reliable results.
This article is part of Analytical grade solvents (p.a.), in Solvents.
Key features
- Dye content: ≥89.0 %
- Appearance of solution: complies
- Loss on drying (110 °C): ≤1 %
- Melting point: 241-245 °C
- pH-transition range: 5.2 (yellow) - 6.8 (purple)
- CAS number: 115-40-2
- Pack sizes: 5 g, 25 g
- EG nr.: 204-087-8
- Empirical formula: C₂₁H₁₆Br₂O₅S
- Molar mass: 540,24 g/mol
- Technical Information Sheet:
- Safety Data Sheet:
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Questions about Bromcresol purple, p.a., ACS, 5 g, glass
What is this article?
Bromcresol purple, p.a., ACS, 5 g, glass is the article on this page. Luminix Health distributes Carl Roth for laboratory use. It sits in Analytical grade solvents (p.a.), inside Solvents, in Lab chemicals.
An analytical-grade solvent, often marked p.a., has impurity limits tight enough for classical analysis and for preparing reagents. It is not automatically low enough in UV absorbance for HPLC, and it is not dry enough for a water-sensitive reaction. The grade is the purchase.
A solvent dissolves. The grade says which impurities are low enough for the method. Analytical grade is the ordinary pure solvent. HPLC and LC-MS grades limit the absorbance and the ions that would become peaks or background. A dry solvent has had water removed. A deuterated solvent is for NMR, where the hydrogen signal would otherwise drown the sample. Technical grade is for cleaning and for synthesis that does not need a chromatogram. Identity is on PubChem. Names follow IUPAC. Hazards follow ECHA, the CLP Regulation and REACH.
Which category should I open next?
The category is Solvents. The sub-category is Analytical grade solvents (p.a.). The catalogue is Lab chemicals.
Shelves beside this one are HPLC & LC-MS grade solvents, Dry & deuterated solvents (NMR, synthesis), Technical & synthesis grade solvents and Green & alternative solvents.
What should I check before I order?
The technical information on this page is the manufacturer's sheet. Read that, not a rewritten specification.
When this page shows a safety data sheet, use that manufacturer file. Hazard text does not belong in the sales description. For a pack size, a grade or a certificate that is not on the page, send a quote request or contact the team.
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Luminix Health distributes this article from the heart of Europe. Delivery across Europe, two to five days when in stock. Standard delivery is free from €250 excl. VAT. Cold-chain goods and dangerous goods under ADR are never included in that free delivery. The terms are in the Shipping Policy. The full brand index is on shop by brand. Who we are is on about us.
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The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.
