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Phenolphthalein (/ f ɛ ˈ n ɒ l (f) θ ə l iː n / [citation needed] feh-NOL(F)-thə-leen) is a chemical compound with the formula C 20 H 14 O 4 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.
The meter reading (in millivolts) is plotted against the volume of titrant. The end point is taken at the distinct inflection of the resulting titration curve corresponding to the basic buffer solution. Color indicating titration: An appropriate pH color indicator e.g. phenolphthalein, is used. Titrant is added to the sample by means of a burette.
The Kastle–Meyer test is a presumptive blood test, first described in 1903, in which the chemical indicator phenolphthalein is used to detect the possible presence of hemoglobin. It relies on the peroxidase -like activity of hemoglobin in blood to catalyze the oxidation of phenolphthalin (the colorless reduced form of phenolphthalein) into ...
Three different points in an acid-base titration using phenolphthalein as the indicator Phenolphthalein is widely recognized as one of the most commonly used acid-base indicators in chemistry. [ 12 ] Its popularity is because of its effectiveness in a broad pH range and its distinct colour transitions. [ 12 ]
If the test solution is of a dark colour, it is preferable to use a paper universal indicator, such as Hydrion paper. Solution: The main components of a universal indicator, in the form of a solution, are thymol blue , methyl red , bromothymol blue , and phenolphthalein .
Missouri executed a man Tuesday night for the 2007 sexual assault and murder of a fourth-grade girl who called him "Uncle Chris." Gov. Mike Parson denied his clemency petition earlier this week ...
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Use a walking pole or balance stick if you struggle with balance. Perform only the first half of your chosen indoor walking workout until you feel confident to complete the whole session.