Phenolphthalein is a chemical substance called an acid-base indicator., It helps us identify whether a solution is acidic, basic, or neutral by changing its colour., In an Acidic Solution, When phenolphthalein is added to an acidic solution (such as hydrochloric acid), it remains colourless., This is because acidic solutions do not allow phenolphthalein to develop its pink colour., When a Base is Added, As sodium hydroxide (a base) is added slowly, it starts reacting with the acid., The acid and base neutralize each other., During this stage, the solution remains colourless until almost all the acid has reacted., When the acid has been completely neutralized, the solution becomes neutral., Phenolphthalein changes from colourless to light pink in a basic solution.

Phenolphthalein

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