Description
Chlorophenol red p.a. is an analytical indicator dye with CAS number 4430-20-0, empirical formula C₁₉H₁₂Cl₂O₅S and molar mass 423,27 g/mol. Supplied as a p.a. grade solid EG number 224-619-2 supports substance identification in laboratory documentation and purchasing records. This material from manufacturer Carl ROTH belongs to the indicator and pH-indicator group used for visual end-point detection and solution monitoring. The compact glass presentation helps preserve reagent integrity during storage and dispensing of small analytical portions. Analysts employ chlorophenol red in titrations, buffer checks and teaching or routine assays that rely on clear colour transitions. Specification of purity grade, molecular formula and molar mass enables straightforward integration into validated methods and reagent inventories without ambiguity about identity or pack format.
This article is part of Analytical grade solvents (p.a.), in Solvents.
Key features
- Maximum absorption: 560-575 nm
- Loss on drying (110 °C): ≤5 %
- CAS number: 4430-20-0
- Pack sizes: 5 g, 10 g, 25 g
- EG nr.: 224-619-2
- Empirical formula: C₁₉H₁₂Cl₂O₅S
- Molar mass: 423,27 g/mol
- Technical Information Sheet:
- Safety Data Sheet:
Compliance & Safety Information
WarningHazard Statements (H-Phrases)
Precautionary Statements (P-Phrases)
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Questions about Chlorophenol red, p.a., 5 g, glass
What is this article?
Chlorophenol red, p.a., 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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