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3. Which color change isobserved on adding a drop ofphenolphthalein is added to asolution of calcium hydroxide ?​

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Answer:

It is colorless when it is an ACID and pink when it is a BASE. Lime water is a calcium hydroxide SOLUTION, CA(OH)2, which is a base. Lime water was added to the regular water in the solution. Lime water is a base, so when the phenolphthalein was added to the solution, it turned the solution pink.

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