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Phenolphthalein - Wikipedia


Phenolphthalein is a chemical compound with the formula C20H14O4 and is often written as "HIn" or "phph" in shorthand notation. Phenolphthalein is often used as an indicator in a...

What does phenolphthalein changing pink indicate? | Reference.com


Phenolphthalein is an indicator that turns from clear to pink in a basic ... creating more phenolphthalein ions, which causes the color to change. ... About.com says, "For a properly performed titration, the volume difference between the end point ...

Titration - end point detection


Apr 10, 2012 ... basic information about end point detection in titration. ... Methyl red changes its color between pH 4.4 and 6.2. .... it doesn't matter much whether we titrate till we start to see phenolphthalein, or till the color change is complete ...

Acid base titration end point detection


Apr 6, 2012 ... However, color change is not instant (see acid-base indicators). ... titration curve of strong acid titrated with strong base against phenolphthalein.

acid-base indicators - Chemguide


Describes how indicators work, and their use in various acid-base titrations. ... At some point during the movement of the position of equilibrium, the ... the reason for the colour changes in methyl orange and phenolphthalein, they are ...

6. Acid-Base Indicators - Chemistry LibreTexts


Aug 21, 2015 ... You should be able to work out for yourself why the color changes when you add ... Phenolphthalein is another commonly used indicator for titrations, and is ... At this point the concentrations of the acid and its ion are equal.

BBC - GCSE Bitesize Science - Titrations : Revision


... are mixed together. Titrations are used to determine the concentration of an acid or alkali. ... Phenolphthalein changes colour sharply at about pH 8. For most  ...

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 ... First, what's the purpose of an acid-base indicator? ... can of course testify to the color change property of phenolphthalein, recalling that ...

Brown color at end point during titration with phenolphthalein as ...


Apr 4, 2016 ... Brown color at end point during titration with phenolphthalein as ... How to prove at what pH the color of an indicator will change based on its ...

Indicators - Science


Indicators are substances whose solutions change color due to changes in pH. These are called .... Phenolphthalein in the table above has a pKai value of 9.7, which is the closest to the pH of equivalence point in this titration. This indicator is  ...