Crossword clues for phenolphthalein
The Collaborative International Dictionary
Phenolphthalein \Phe`nol*phthal"e*in\, n., or Phenol phthalein \Phenol phthalein\(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 an indicator. It is sometimes used as a laxative in veterinary medicine.
Wiktionary
n. (context chemistry English) A quinone derivative used as a pH indicator, and once used as a laxative
WordNet
n. 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
Wikipedia
Phenolphthalein is a chemical compound with the formula C H O and is often written as "HIn" or "phph" in shorthand notation. Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions.
Phenolphthalein is slightly soluble in water and usually is dissolved in alcohols for use in experiments. It is a weak acid, which can lose H ions in solution. The phenolphthalein molecule is colorless, and the phenolphthalein ion is pink. When a base is added to the phenolphthalein, the molecule ⇌ ions equilibrium shifts to the right, leading to more ionization as H ions are removed. This is predicted by Le Chatelier's principle.
Usage examples of "phenolphthalein".
A test with the phenolphthalein presumptive blood test revealed that it was.
She treated this with phenolphthalein and a moment later she had the answer.
Each is about the size of a quarter and oval-shaped, and she swabs one of them, then drips isopropyl alcohol, then phenolphthalein, then hydrogen peroxide on the swab and it turns bright pink.
A little aluminum sulphate dissolved, a few drops of phenolphthalein, and now .