Description
Cresol red sodium salt is a p.a. grade acid–base indicator dye supplied for analytical chemistry. With CAS number 62625-29-0 and empirical formula C₂₁H₁₇O₅SNa, it has a molar mass of 404,41 g/mol. As the sodium salt of cresol red, it dissolves readily for preparation of indicator solutions used in pH titration and visual end-point detection. The reagent belongs to the sulfonephthalein family and is applied in aqueous and mixed-solvent systems where clear colour transitions are needed. The p.a. specification supports analytical workflows in quality control, teaching laboratories and research settings that rely on reliable pH indicators. Use according to established titration protocols for consistent visual read-out.
This article is part of Indicators & indicator solutions, in Analytical standards & reference materials.
Key features
- Absorption peak (0,001 % in 0,01 N NaOH): 568 nm-576 nm
- pH-transition range: 7,0 (yellow)-8,8 (purple)
- CAS number: 62625-29-0
- Pack sizes: 5 g, 25 g
- EG nr.: 263-654-8
- Empirical formula: C₂₁H₁₇O₅SNa
- Molar mass: 404,41 g/mol
- Technical Information Sheet:
- Safety Data Sheet:
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Questions about Cresol red sodium salt, p.a., 5 g, plastic
What is this article?
Cresol red sodium salt, p.a., 5 g, plastic 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.
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