Description
Bromophenol red free acid is a p.a. grade indicator dye for analytical chemistry, listed under CAS number 2800-80-8 with empirical formula C₁₉H₁₂Br₂O₅S. The molar mass is 512,19 g/mol, enabling precise preparation of indicator solutions and calibration mixtures. Material from manufacturer Carl ROTH carries EG nr. 220-538-1, supporting consistent identification across purchasing and quality systems. As a free-acid bromophenol red, it belongs to the sulfonephthalein family widely applied in pH indication and related analytical procedures. The p.a. designation and compact glass pack support controlled dispensing and documentation in teaching, routine analysis and method development. Laboratories can rely on the stated CAS, formula and molar mass when writing SOPs, calculating concentrations or comparing lots, staying within the manufacturer’s published specification for this indicator.
This article is part of Analytical grade solvents (p.a.), in Solvents.
Key features
- Appearance: red brown powder
- Loss on drying: ≤5.0 %
- pH-transition range: 5.2 (yellow-red)-7.0 (purple)
- CAS number: 2800-80-8
- Pack sizes: 1 g, 5 g, 50 g
- EG nr.: 220-538-1
- Empirical formula: C₁₉H₁₂Br₂O₅S
- Molar mass: 512,19 g/mol
- Technical Information Sheet:
- Safety Data Sheet:
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Questions about Bromophenol red free acid, p.a., 1 g, glass
What is this article?
Bromophenol red free acid, p.a., 1 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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