Phenolphthalein ( feh-NOL(F)-thə-leen) is a chemical compound with the formula C20H14O4 and is often written as HIn, HPh, phph or simply Ph 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. It belongs to the class of dyes known as phthalein dyes.
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 nonionized phenolphthalein molecule is colorless and the double deprotonated phenolphthalein ion is fuchsia. Further loss of proton in higher pH occurs slowly and leads to a colorless form. Phenolphthalein ion in concentrated sulfuric acid is orange red due to sulfonation.
Cambrian
-
Of or pertaining to the lowest subdivision of the rocks
of the Silurian or Molluscan age; -- sometimes described as inferior to
the Silurian. It is named from its development in Cambria or Wales. See
the Diagram under Geology.
Cambrian meaning & definition 1 of Cambrian.
-
A spunky individual with sass and attitude. Shes the boss of the world, or at least she thinks she is. But its okay. Shes awesome and the most fun to be around. Shes the coolest sister a person could have. Shes also a professional cat wrestler and honorary cross country coach.
Cambrian meaning & definition 2 of Cambrian.
Similar Words