Description
Neutral red (C.I. 50040) is a p.a. grade dye indicator with CAS number 553-24-2 and empirical formula C₁₅H₁₇ClN₄. Its molar mass is 288,78 g/mol, supporting precise preparation of indicator solutions for analytical work. Categories of use include titration and redox indicator applications in routine and research settings. The Colour Index designation C.I. 50040 identifies the dye system for documentation and method transfer. Neutral red from manufacturer Carl ROTH is offered at analytical (p.a.) quality for controlled reagent preparation. The compact glass presentation helps maintain integrity during storage and dispensing on the bench. With EG number 209-035-8, the product integrates cleanly into inventory and safety documentation. Laboratories can deploy it for indicator stock solutions and redox titration protocols that call for this established dye chemistry.
This article is part of Analytical grade solvents (p.a.), in Solvents.
Key features
- Appearance of solution: clear red
- pH-transition range: 6.8 (red)- 8.0 (yellow)
- Maximum absorption: 528-558 nm
- CAS number: 553-24-2
- Pack sizes: 10 g, 1 g, 25 g, 50 g, 100 g
- EG nr.: 209-035-8
- Empirical formula: C₁₅H₁₇ClN₄
- Molar mass: 288,78 g/mol
- Technical Information Sheet:
- Safety Data Sheet:
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Questions about Neutral red (C.I. 50040), p.a., 1 g, glass
What is this article?
Neutral red (C.I. 50040), 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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