what would be the colour of NaoH solution when phenopthalein indicator is added.
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Phenolphthalein remains colourless in neutral or acidic solution but turns out magenta or pink in basic solutions.
When it is added to NaOH, the solution has the colour of pink since sodium hydroxide is a strong base.
If HCl is added the solution loses its colour and turns out colourless since HCl neutralizes sodium hydroxide being an acid.
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Answer:
phenopthalein indicator turns into pink when NaOH is added.
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