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To Conclude: The given liquids are acid or base or neutral.
Explanation of Solution
Introduction:
Phenolphthalein is an indicator that is colorless in acids, but turns bright pink in bases.
There are three equal amounts of colorless liquids-A, B, and C.
When several drops of phenolphthalein is added to each liquid, A and B remain colourless, but C turns pink. This indicates liquid C is a basic solution; asphenolphthalein turns bright pink in bases.
When liquid C is added to A, the pink colour disappears. The disappearance of pinkcolour maybe due to neutralization of liquid C (a base) by liquid A. An acid only can neutralize a base.
Thus, liquid A can be assumed an acidic solution. When the rest of the liquid C is addedto B, the mixture becomes pink.The mixture maybe basic, as phenolphthaleingives pink color only in bases. As liquid C is already a base, liquid B has to be a neutral solution, for addition of a base (C) increases its pH and the mixture becomes basic.
Conclusion: From the changes in color of phenolphthalein, it can be concluded thatliquid A is an acidic solution, liquid B is a neutral solution and liquid C is a basic solution.
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