Description
Bromthymol blue is a p.a., ACS-grade pH indicator with CAS number 76-59-5, EG number 200-971-2 and empirical formula C₂₇H₂₈Br₂O₅S. The molar mass is 624,40 g/mol, which supports reproducible preparation of indicator solutions for acid–base titrations and pH monitoring near the neutral range. Bromthymol blue is a well-established sulfonephthalein dye used to visualise pH transitions in aqueous media, culture-related observations and general laboratory demonstrations. The p.a., ACS quality from manufacturer Carl ROTH gives laboratories a clearly specified grade for validated methods and teaching protocols. Full identity data—empirical formula, molar mass, CAS and EG numbers—simplify documentation, purchasing and cross-checking against monographs or internal specifications. Glass primary packaging is suited to storage of the crystalline indicator prior to dissolution.
This article is part of Analytical grade solvents (p.a.), in Solvents.
Key features
- Appearance: light pink powder
- Appearance of solution: complies
- pH-transition range: 6.0 (yellow) - 7.6 (blue)
- Loss on drying (110 °C): ≤3 %
- CAS number: 76-59-5
- Pack sizes: 5 g, 25 g, 50 g, 100 g
- EG nr.: 200-971-2
- Empirical formula: C₂₇H₂₈Br₂O₅S
- Molar mass: 624,40 g/mol
- Technical Information Sheet:
- Safety Data Sheet:
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Questions about Bromthymol blue, p.a., ACS, 5 g, glass
What is this article?
Bromthymol blue, 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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