Description
4-(4-Nitrophenylazo)-1-naphthol is an analytical-grade azo dye reagent supplied at p.a. quality for laboratory indicator work. With CAS number 5290-62-0, empirical formula C₁₆H₁₁N₃O₃ and molar mass 293,28 g/mol, it is used in metal-indicator and analytical chemistry applications where a defined nitrophenylazo-naphthol structure is required. The compound is Categories such as analytical chemicals, indicators and metal indicators reflect its typical role in qualitative and quantitative metal detection workflows. This material from manufacturer Carl ROTH carries EG number 226-129-4 and supports reproducible laboratory practice when handled according to standard chemical hygiene. The solid reagent is convenient for weighing small analytical portions and for preparing stock solutions under controlled conditions. Laboratories working with azo-based metal indicators will find the p.a. grade appropriate for method development, teaching experiments and routine analytical checks that depend on consistent dye identity and documented composition.
This article is part of Analytical grade solvents (p.a.), in Solvents.
Key features
- Appearance: red brown powder
- Suitability as indicator for complexometry: complies
- Loss on drying: ≤1 %
- CAS number: 5290-62-0
- Pack sizes: 10 g, 25 g, 100 g
- EG nr.: 226-129-4
- Empirical formula: C₁₆H₁₁N₃O₃
- Molar mass: 293,28 g/mol
- Technical Information Sheet:
- Safety Data Sheet:
Compliance & Safety Information
Warning
Hazard Statements (H-Phrases)
Precautionary Statements (P-Phrases)
Recently viewed
You may also like
Questions about 4-(4-Nitrophenylazo)-1-naphthol, p.a., 10 g, glass
What is this article?
4-(4-Nitrophenylazo)-1-naphthol, p.a., 10 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.
How does ordering and shipping work?
Luminix Health distributes this article from the heart of Europe. Articles in stock ship within 2–5 business days. Standard delivery is free from €250 excl. VAT. Cold-chain goods and dangerous goods under ADR are never included in that free delivery. The terms are in the Shipping Policy. The full brand index is on shop by brand. Who we are is on about us.
Which other categories should I open?
The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.