Description
Phenolphthalein (C.I. 764) is an analytical-grade pH indicator with a minimum purity of 99 % (p.a.), CAS number 77-09-8 and empirical formula C₂₀H₁₄O₄. The compound has a molar mass of 318,33 g/mol, a density of 1,3 g/cm³ and a boiling point above 450 °C. It is a standard reagent for acid–base titrations and related volumetric work, where the sharp colourless-to-pink transition marks the endpoint in the alkaline range. This from manufacturer Carl ROTH supplies a practical quantity for routine analytical workflows, quality-control laboratories and teaching environments. As a classic phthalein dye, phenolphthalein delivers a clear visual response in aqueous and mixed-solvent systems and is widely specified among analytical chemicals and pH indicators. The pro analysi grade supports reproducible endpoint detection for standardisation, process monitoring and educational demonstrations that require a well-characterised indicator free from unnecessary impurities. Its documented physicochemical profile makes it a reliable choice for laboratories performing classical volumetric analysis.
This article is part of Indicators & indicator solutions, in Analytical standards & reference materials.
Key features
- Appearance: white to off-white powder
- Assay: 97.0-101.0 %
- Transition range: 8.0 (colourless) - 10.0 (red)
- Loss on drying: ≤1.0 %
- Clarity of alcohol solution: complies
- CAS number: 77-09-8
- Pack sizes: 100 g, 50 g, 500 g
- EG nr.: 201-004-7
- Purity: min. 99 %, p.a.
- Empirical formula: C₂₀H₁₄O₄
- Molar mass: 318,33 g/mol
- Technical Information Sheet:
- Safety Data Sheet:
Compliance & Safety Information
DangerHazard Statements (H-Phrases)
Precautionary Statements (P-Phrases)
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Questions about Phenolphthalein (C.I. 764), min. 99 %, p.a., 100 g, plastic
What is this article?
Phenolphthalein (C.I. 764), min. 99 %, p.a., 100 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.
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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.
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