Two drops of the indicator phenolphthalein were added to 10ml solution of sodium hydroxide
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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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When two drops of the indicator phenolphthalein were added to 10ml solution changes from colourless to pink.
This is because phenolphthalein is acid-base solution. so it is colourless in acidic solution and pink in basic solution NaOH is basic in nature, solution turns pink.
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