Question

You have been provided with three test-tubes. One of these test-tubes contains distilled water and the other two contain an acidic and a basic solution respectively. If you are given only blue litmus paper, how will you identify the contents of each test-tube?

Answer 1

You will add blue litmus to all the solutions the one in which it turns red is the acid . Now take the acid and add it to the other two . The one in which neutralisation reaction takes place is the base or in which the one red litmus turns blue again . The third one is the neutral solution.

Answer 2

Answer:

BTS

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(i) Put the red litmus paper in all the test tubes, turn by turn. The solution which turns red litmus to blue will be a basic solution. The blue litmus paper formed here can now be used to test the acidic solution.

(ii) Put the blue litmus paper obtained above in the remaining two test-tubes, turn-by-turn. The solution which turns the blue litmus paper to red will be the acidic solution.

(iii) The solution which has no effect on any litmus paper will be neutral and hence it will be distilled water