Description
Ethyl red is a p.a. grade pH indicator dye intended for analytical and teaching laboratories that require a clearly defined colour-change reagent. Identified by CAS number 76058-33-8, it has the empirical formula C₁₇H₁₉N₃O₂ and a molar mass of 297,36 g/mol, data that support accurate solution preparation and documentation in method SOPs. The product is Positioned among analytical chemicals and pH indicators, ethyl red suits classical volumetric workflows and related colourimetric observation. The glass pack helps protect the solid during storage and repeated opening in shared laboratory environments. Material from manufacturer Carl ROTH provides a straightforward option when CAS, formula and molar-mass traceability are needed without expanding pack size beyond routine laboratory demand. Prepare and apply in accordance with standard indicator procedures for acid–base endpoints.
This article belongs on Analytical grade solvents (p.a.), in Solvents.
Key features
- Appearance: dark red to maroon powder
- Appearance of solution (0,1 % in H2O): clear, dark red
- pH-transition range: 4,5 (red)-6,5 (yellow)
- CAS number: 76058-33-8
- Pack sizes: 5 g, 25 g, 100 g
- Empirical formula: C₁₇H₁₉N₃O₂
- Molar mass: 297,36 g/mol
- Grade: p.a.
- Technical Information Sheet:
- Safety Data Sheet:
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Questions about Ethyl red, p.a., 5 g, glass
What is this article?
Ethyl 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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The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.