By adding phenothelem and castic soda what will happen
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Phenolphthalein is an acid-base indicator that is colorless in acidic solutions and pink in basic solutions.
After enough sodium hydroxide solution has been added to react with all of the hydrogen ions, the next drop of base will provide a slight excess of hydroxide ions and the solution will turn pink.
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When the sodium hydroxide, which is a base, is mixed with phenolphthalein, it turns pink.
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