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phthalein

酞; 酞类

□; □类

The Collaborative International Dictionary of English v.0.48 (gcide)

Phthalein \Phthal"e*in\, n. [See {Phthalic}.] (Chem.)
One of a series of artificial organic dyes made as
condensation products of the phenols with phthalic acid, and
well represented by phenolphthalein. Their alkaline solutions
are fluorescent.
[1913 Webster]

{Phenol phthalein}, a white or yellowish white crystalline
substance made from phthalic acid and phenol. Same as
{phenolphthalein}.
[1913 Webster PJC]

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Phthalein dye - Wikipedia
Phthalein dyes are a class of dyes mainly used as pH indicators, due to their ability to change colors depending on pH [1] They are formed by the reaction of phthalic anhydride with various phenols
Phenolphthalein Indicator - Science Notes and Projects
Phenolphthalein is a common pH indicator that is colorless under acidic conditions and fuchsia pink under alkaline conditions Phenolphthalein indicator is a pH indicator solution that is colorless under acidic and extremely alkaline conditions and fuchsia pink under ordinary alkaline conditions
PHTHALEIN Definition Meaning | Merriam-Webster Medical
The meaning of PHTHALEIN is any of various xanthene dyes (as phenolphthalein or fluorescein) that are intensely colored in alkaline solution
Phenolphthalein | pH indicator, acid-base titration, indicator dye . . .
Phenolphthalein, (C20H14O4), an organic compound of the phthalein family that is widely employed as an acid-base indicator As an indicator of a solution’s pH, phenolphthalein is colourless below pH 8 5 and attains a pink to deep red hue above pH 9 0
Phthalein - an overview | ScienceDirect Topics
Phthalein is defined as a class of indicators that are typically colorless in moderately acidic solutions and exhibit various colors in alkaline media, with structural changes leading to color transitions, as exemplified by phenolphthalein
What Is Phenolphthalein Indicator and How Does It Work?
Explore phenolphthalein: the essential chemical indicator whose molecular structure visibly reveals changes in acid-base concentration for precise measurement
Phenolphthalein synthesis - Chemistry Online
Phenolphthalein (C 20 H 14 O 4) is a pH indicator In acidic solutions it remains colorless, but in the presence of basic solutions it takes a pinkish color with a turning point between pH = 8 0 (colorless) to pH = 9 8 (magenta or pinkish)
Phthalein dye - grokipedia. com
Phthalein dyes, classified as a subclass of triarylmethane dyes, exhibit a reversible pH-dependent color transition, shifting from a colorless lactone form in acidic conditions to a colored quinoid form in basic conditions, which underpins their utility as pH indicators
(PDF) Phthalein Dyes: Chemistry and Characteristics - ResearchGate
This comprehensive review endeavors to delve into the nuanced chemistry and defining attributes of phthalein dyes, providing insights into their structural intricacies and expansive applications
Metal phthalein | C32H32N2O12 | CID 44630186 - PubChem
Metal phthalein | C32H32N2O12 | CID 44630186 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety hazards toxicity information, supplier lists, and more

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