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Phenolphthalein, an acid-base indicator used to test the pH of a solution, turns pink due to the presence of a weak base. The indicator itself is a weak, colorless acid that forms ...



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.



Phenolphthalein is a colourless, weak acid which dissociates in water ... the concentration of the anions is too low for the pink colour to be observed. ... The colour of the indicator turns from colour A to colour B or vice versa at its turning point.

What colour does phenolphthalein turn in acid? - Ask.com


Phenolpthalein is colorless in acidic solutions. Phenolpthalein is a chemical commonly employed as a pH indicator. It turns pink in basic solutions that have a pH ...

Research the Topic - How does phenolphthalein work? Part 1

researchthetopic.wikispaces.com/How does phenolphthalein work? Part 1

Sep 30, 2011 ... Phenolphthalein can be used to indicate if a liquid is an acid or a base. ... pink, which starts in a pH of 8 (colorless in acids and pink in bases). ... Litmus paper turns red under a pH of 4.5 and blue and red over a pH of 8.2.

Why Does Phenolphthalein Change Color? | eHow


Phenolphthalein works somewhat differently, as it is naturally colorless but turns pink in alkaline solutions. It remains colorless throughout the range of acidic pH ...

Acid-Base Indicators - Chemistry Department - Elmhurst College


Base, stays same, turns blue ... For phenolphthalein: pH 8.2 = colorless; pH 10 = red ... Phenolphthalein is an indicator of acids (colorless) and bases (pink). ... ( yellow circled atoms) to a double bond which now does contain pi electrons. The pi ...

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


end of an acid-base titration, the pink phenolphthalein color fades if the solution is allowed ... by NaOH, (OH -). to give the pink P2- ion according to the equation:.

When added to a solution, phenolphthalein turned a faint pink ...


Feb 9, 2012 ... Phenolphthalein's pink color slowly fades and becomes clear again if the .... When phenolphthalein turns pink in solution what does it indicate?

Why does phenolphthalein make a base turn pink - Answers.com


Why does Phenolphthalein turn pink in potassium hydroxide solution? phenolphthalein is a weak acid, when reacting with strong alkali it turns pink. 1 person ...

Popular Q&A
Q: Why does phenolphthalein turn pink with certain substances?
A: Phenolphthalein in solution is in constant equilibrium according to the equation H2In < In2- + 2H3O. H2In is colourless whereas In2- is pink. The addition o... Read More »
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Q: Why does phenolphthalein turn pink when mixed with milk of magnes...
A: When a 1% phenolphthalein solution is applied to Read More »
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Q: Why does phenolphthalein turn pink in water (neutral ph) when it ...
A: are you using purified, deionized water? cause if you're not then your water isn't really neutral. Read More »
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Q: Why does phenolphthalein turn soap pink?
A: There are many different substances that serve as pH indicators. For soap making, we want phenolphthalein, specifically, because it's range of measurable color ... Read More »
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Q: Why does ammonia make phenolphthalein turn pink?
A: Due to the increase of the pressure found within the flame of the bunsen burner, the pressure creates a vacuum thus sucking the phenollphthalein up and turning ... Read More »
Source: wiki.answers.com