How is phenolphthalein employed in titration?

Answer

Titration is a technique used to find out how much of a chemical substance is dissolved in a volume of solution. Phenolphthalein is one of the indicators. When it is an acid, it will turn to colorless and if it is base, it will turn into pink.
Reference:
Q&A Related to "How is phenolphthalein employed in titration?"
The pH curve for the strong acid - weak base titration
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To indicate when the substance has been neutralized.
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Phenolphthalein is a weak acid. The weak acid is colourless and its ion is bright pink. Adding extra hydrogen ions shifts the position of equilibrium to the left, and turns the indicator
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You are reacting a strong base with a weak acid. The resulting salt will be basic in character, Therefore it is necessary to have an indicator that changes colour in the basic pH
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