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You have been provided with three test t...

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

Text Solution

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Take a small volume of all the three liquids in three test rubes. Dip red litmus paper strips sparately in all the three. The tube in which red litmus strip turns bule, contains basic solution. Now remove the blue litmus paper and dip it one of the remaining test tubes. If the colour of the bule litmus paper changles to red, the tube contains acidic solution. In case, it remains blue then the tube contains distiled water.
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You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus solution, how will you identify the contents of each test tube ?

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Knowledge Check

  • You have phenolphthalein solution in three test tubes A, B and C. On putting 2-3 drops of dilute hydrochloric acid in A, a solution of sodium hydroxide in B and distilled water in C, if you immediately observe the colour of the solution in each test tube, then you will find that the solution in test tube.

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  • You have phenolphthalein solution in three test tubes A, B and C. On putting 2-3 drops of dilute hydrochloric acid in A, a solution of sodium hydroxide in B and distilled water in cm, if you immediately observe the colour of the solution in each test tube, you will find that the solution in test tube

    A
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    B
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    A is colourless, in B colourless and in C pink
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