Description
Alizarin red S (C.I. 58005) is a pure-grade indicator dye supplied with CAS number 130-22-3, empirical formula C₁₄H₇NaO₇S and molar mass 342,26 g/mol. The Colour Index designation C.I. 58005 identifies this anthraquinone sulfonate used in pH-value determination and related physical-property assays. EG number 204-981-8 completes the regulatory identity data set for documentation. Offered by manufacturer Carl ROTH, this pure quality supports reproducible colour responses in teaching, quality control and routine pH-indicator work. Clear statement of formula, molar mass and C.I. number helps laboratories match the dye to established protocols and catalogue specifications. The glass pack format suits secure storage and controlled dispensing of solid indicator material within chemical stores and analytical benches.
This article belongs on Indicators & indicator solutions, in Analytical standards & reference materials.
Key features
- Absorption max. (in H2O): 550-560 nm
- Loss on drying (110 °C): ≤10.0 %
- pH-transition range: 4.3 (yellow)-6.3 (red violet)
- Transition range: 9.4 (brown orange)-12.0 (violet)
- Suitability as indicator: complies
- CAS number: 130-22-3
- Pack sizes: 10 g, 25 g, 100 g
- EG nr.: 204-981-8
- Empirical formula: C₁₄H₇NaO₇S
- Molar mass: 342,26 g/mol
- Technical Information Sheet:
- Safety Data Sheet:
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Questions about Alizarin red S (C.I. 58005), pure, 10 g, glass
What is this article?
Alizarin red S (C.I. 58005), pure, 10 g, glass is the article on this page. Luminix Health distributes Carl Roth for laboratory use. It sits in Indicators & indicator solutions, inside Analytical standards & reference materials, in Lab chemicals.
An indicator solution changes colour at a stated point, usually a pH interval or a redox potential, so a titration endpoint can be seen. The solvent and the concentration decide how sharp the change is. A solid indicator dye and a ready solution are different articles.
A reference material is the article against which another result is compared. Its value is stated, and the uncertainty of that value is part of the product. An ICP or ion standard is a solution of known concentration. A volumetric standard is for titration. A chromatography standard is the peak you match. The grade names, including pharmacopoeia and ASTM, say which impurities were limited. Identity is checked on PubChem. Names follow IUPAC. Medicinal grades follow the European Pharmacopoeia and USP.
Which category should I open next?
The category is Analytical standards & reference materials. The sub-category is Indicators & indicator solutions. The catalogue is Lab chemicals.
Shelves beside this one are ICP, AAS & ion standards, Chromatography standards (GC, HPLC, pesticides), Reference substances & reagents (other), Volumetric standard solutions (titration), Reagents for analysis (Ph. Eur., ASTM, DIN) and Spectroscopy & physical property standards.
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.