Define Phenolphthaleins. Phenolphthaleins synonyms, Phenolphthaleins pronunciation, Phenolphthaleins translation, English dictionary definition of Phenolphthaleins. n. A white or pale yellow crystalline powder, C20H14O4, used as an acid-base indicator, i
Phenolphthalein, normally colourless, attains a deep red hue above pH 10.0. 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 ...
: a white or yellowish white compound used as a laxative and as an acid-base indicator because its solution is brilliant red in alkalies and clear in acids Medical Definition phenolphthalein noun phe·nol·phtha·lein ˌfēn-ᵊl-ˈthal-ē-ən -ˈthal-ˌēn -ˈ...
phenolphthalein: A dye used as anacid-base indicator. It is colourlessbelow pH 8 and red above pH 9.6. Itis used in titrations involving weakacids and strong bases. It is also usedas a laxative. brand name Evac-Q-Tabs (Savage); Ex-Lax (Novartis); Modane (Savage); Prulet (Mission ...
Related Articles What Is the Equivalence Point? What is a Nonelectrolyte? What is Titration? What is the Difference Between an Acid and a Base? Discussion Comments Byanon310850— On Dec 27, 2012 Is it the same exact powder used in laxatives as in the laboratory? Or are there ingredients ...
An acid–base indicator that is colorless in acid solutions and becomes red if the pH rises above the transition range of 8–9.6. It is used as the indicator in titrations for which the end point lies clearly on the basic side (pH>7), e.g. oxalic acid or potassium hydrogentartrate ag...
英汉-汉英词典 n.酚酞 近义、反义、联想词 词 n. laxative,acid-base indicator 联想词 reagent试剂;hydroxide氢氧化物;acetone丙酮;pH酸碱度符号;solubility溶度,溶性,可解决性,可解释性,溶解性;aqueous水的,水般的;ammonia氨,阿摩尼亚;hydrochloride氢氯化物;colorless无色的;benzene苯;liquid液体的; ...
In acid base titration, how does an indicator work? Why are some salt solutions acidic, and why are some basic? Explain why the pH does not change significantly when a small amount of an acid or a base is added to a solution that contains equal amounts of the base NH_3...
Name:Phenolphthalein,CAS:77-09-8.Use:Used as an acid-base indicator stimulant laxative for the treatment of constipation.Buy Phenolphthalein.Molecular Fomula:C20H14O4,Molar Mass:318.32,Density:1.27 g/cm3 at 32 °C,Melting Point:261-263 °C (lit.),Boling
The molecule found its first use as a pH indicator as it’s colourless in acids but turns bright purple-pink in alkaline solutions. If you’ve ever done an acid base titration experiment or used pH indicators in research then it’s likely that phenolphthalein was involved. It’s also used...