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phenolphthalein 音标拼音: [f,inɑlfθ'elən] [f,ɛnɑlfθ'elən]

n. 酚酞

酚□

WordNet (r) 3.0 (2006) (WordNet)

phenolphthalein
n 1: a laxative used in many preparations under various trade
names; also used as an acid-base indicator in titrations
involving weak acids and strong bases because it is
brilliant red at high alkalinity and colorless below pH 8

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

Phenolphthalein \Phe`nol*phthal"e*in\, or Phenol phthalein
\Phenol phthalein\, n. (Chem.)
A white or yellowish white crystalline substance, {C20H14O4},
formed by condensation of the anhydride of phthalic acid and
phenol. Its solution in alkalies is brilliant red, but is
decolorized by acids. This reaction, being very delicate, is
used as a pH indicator. It is sometimes used as a laxative in
veterinary medicine.
[Webster 1913 Suppl. PJC]

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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
Phenolphthalein Indicator - Science Notes and Projects
Phenolphthalein indicator is a pH indicator solution that is colorless under acidic and extremely alkaline conditions and fuchsia pink under ordinary alkaline conditions Here is a look at the colors at different pH ranges, the chemistry of the color change, how to make phenolphthalein indicator, and uses of the chemical
Phenolphthalein | C20H14O4 | CID 4764 - PubChem
Phenolphthalein | C20H14O4 | CID 4764 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety hazards toxicity information, supplier lists, and more
Phenolphthalein | Magnificent molecules - RSC Education
The origins of phenolphthalein lie in the German chemical industry during the heyday of artificial dye discovery in the late 19th century An organic molecule made of only carbon, hydrogen and oxygen, it was first synthesised in 1871 by Adolf von Baeyer, who combined phenol and phthalic anhydride in the presence of sulfuric acid or zinc
What is Phenolphthalein? - BYJUS
Phenolphthalein, an organic compound with the chemical formula C20H14O4, is a weak acid which can be used as an indicator for acid-base titrations In acidic solutions, the compound is colourless It is pinkish in simple solutions (with the transition occurring around pH 9)
Phenolphthalein Indicator: Synthesis, Uses, Properties, Preparation
Phenolphthalein is an organic compound that serves as a laboratory reagent and pH indicator It stimulates the intestinal mucosa and constricts smooth muscles, causing laxative effects The fact that phenolphthalein may be carcinogenic, however, has led to its discontinuation as a laxative
Phenolphthalein - C20H14O4 - GeeksforGeeks
Phenolphthalein test is a presumptive test used for the identification of blood It is based on the catalytic peroxidase-like activity of the heme group in hemoglobin, which is present in red blood cells
Phenolphthalein - Chemistry Online
What is phenolphthalein? Phenolphthalein (molecular formula 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 on a pinkish color with a turning point between pH = 8 0 (colorless) to pH = 9 8 (magenta or pinkish)
Phenolphthalein - an overview | ScienceDirect Topics
Phenolphthalein is widely used as an acid-base indicator It is a definite chemical compound, colorless in acid solutions and red or pink in alkaline liquids • While phenolphthalein undergoes photodegradation in the air and is not considered dangerous for the ozone layer, it is a severe water pollutant •
What Does Phenolphthalein Indicate? | Chemical Clarity
Phenolphthalein is a widely used chemical compound in various applications, particularly in the field of chemistry This organic compound is best known for its role as an acid-base indicator Its ability to change color depending on the pH of a solution makes it invaluable in titrations and other analytical procedures

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