1 . How can phenolphthalien help in the indentification of acid or base ? Explain.
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Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions. It belongs to the class of dyes known as phthalein dyes. ... It is a weak acid, which can lose H+ ions in solution.
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