We can find out by using an indicator like litmus paper. If on putting some drops of the liquid on red litmus paper it turns blue, the liquid is a base and if it remains unchanged then it is an acid.
Question
If you are given a colourless liquid, how will you find out if it is an acid or a base without tasting it?
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Paheli observed that most of the fish in the pond of her village were gradually dying. She also observed that the waste of a factory in their village is flowing into the pond which probably caused the fish to die. (a) Explain why the fish were dying. (b) If the factory waste is acidic in nature, how can it be neutralised?
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You are provided with three test tubes A, B and C as shown in figure with different liquids. What will you observe when you put (a) a piece of blue litmus paper in each test tube? (b) a piece of red litmus paper in each test tube? (c) a few drops of phenolphthalein solution to each test tube?
Open Answer » Boojho, Paheli and their friend Golu were provided with a test tube each containing China rose solution which was pink in colour. Boojho added two drops of solution ‘A’ in his test tube and got dark pink colour. Paheli added 2 drops of solution ‘B’ to her test tube and got green colour. Golu added 2 drops of solution ‘C’ but could not get any change in colour. Suggest the possible cause for the variation in their results.
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