Description
Alizarin (C.I. 58000) is an analytical-grade pH indicator dye covering the transition range 5,5–6,8, registered under CAS number 72-48-0 with empirical formula C₁₄H₈O₄. The reagent shows a molar mass of 240,21 g/mol, density of 1,575 g/cm³ and boiling point of 430 °C, and is classified with UN number 3077. Applications include classical pH titration endpoints, qualitative inorganic tests and colourimetric method development where C.I. 58000 is specified. Material from manufacturer Carl ROTH is supplied at p.a. quality with EG nr. 200-782-5, supporting reproducible indicator performance across batches. The glass container protects the solid dye during storage and dispensing, while the stated transition interval helps analysts select suitable buffer systems and visual or instrumental readout conditions.
This article is part of Analytical grade solvents (p.a.), in Solvents.
Key features
- Appearance: orange powder
- Loss on drying (105 °C): ≤1.5 %
- Sulphated ash: ≤1 %
- pH transition range: 5.5 (yellow)-6.8 (violet)
- Transition range: 10.1 (violet)-12.1 (purple)
- CAS number: 72-48-0
- Pack sizes: 50 g, 25 g, 100 g
- Empirical formula: C₁₄H₈O₄
- Molar mass: 240,21 g/mol
- Density: 1,575 g/cm³
- Technical Information Sheet:
- Safety Data Sheet:
Compliance & Safety Information
DangerHazard Statements (H-Phrases)
Precautionary Statements (P-Phrases)
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Questions about Alizarin (C.I. 58000), p.a., pH-Indicator 5,5-6,8, 50 g, glass
What is this article?
Alizarin (C.I. 58000), p.a., pH-Indicator 5,5-6,8, 50 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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