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Phenolphthalein has been used for over a century as a laxative, but ... to contain blood, commonly known as the Kastle-Meyer test.



Phenolphthalein is an organic compound (C20H14O4) used as an acid-base indicator. The compound is colorless in acidic solution and pinkish in basic ...

phenolphthalein | C20H14O4 - PubChem


phenolphthalein | C20H14O4 | CID 4764 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, ...

Phenolphthalein | Define Phenolphthalein at Dictionary.com


Phenolphthalein definition, a white, crystalline compound, C 2 0 H 1 4 O 4 , used as an ... Learn the correct uses of these two commonly confused homophones.

Acid-Base Indicators - Chemistry Department - Elmhurst College


The most common method to get an idea about the pH of solution is to use an acid base ... A properly selected acid-base indicator can be used to visually " indicate" the ... Phenolphthalein is an indicator of acids (colorless) and bases ( pink).

BBC - GCSE Bitesize Science - Titrations : Revision


Three indicators are commonly used to show whether a solution is acidic or alkaline: litmus ... Phenolphthalein changes colour sharply at about pH 8. For most ...

Phenolphthalein-NaOH Kinetics Phenolphthalein is one of the most ...


Phenolphthalein is one of the most common acid-base indicators used to determine ... end of an acid-base titration, the pink phenolphthalein color fades if the ...

Titration Problems


This webpage describes a procedure called titration, which can be used to find the ... In our example, phenolphthalein, which is a commonly used acid‑base ...

Phenolphthalein Laxatives and Risk of Cancer


Subsequently, most phenolphthalein-containing laxatives were voluntarily ... other than phenolphthalein [or anthraquinones, which were not commonly used in ...



Phenolphthalein is a colorless, weak acid which dissociates in water forming magenta anions. ... The table gives examples of common indicators. ... Indicators are used in titration solutions to signal the completion of the acid-base reaction.

More Info

acid-base indicators - Chemguide


Methyl orange is one of the indicators commonly used in titrations. ... Phenolphthalein is another commonly used indicator for titrations, and is another weak acid ...

What is Phenolphthalein? (with pictures) - wiseGEEK


Jul 31, 2016 ... Phenolphthalein is a mild acid that can be used for medical and scientific purposes. When used in medicine, this compound is most commonly ...

Why do we use phenolphthalein as an indicator in titration? - Quora


Nov 25, 2015 ... Well, you may have used phenolphthalein as the indicator in a particular titration you .... Some other commonly employed indicators are bromothymol blue, thymol blue, alizarine yellow, methyl red, litmus and the list goes on].