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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 paper, how will you identify the contents of each test tube?
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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 paper, how will you identify the contents of each test tube?

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Solution

Litmus paper is used as an indicator to determine whether solution is acidic or basic.  The acids turn blue litmus red and bases turn red litmus blue. This means a red litmus paper turns blue under basic or alkaline conditions. The contents of three test tubes ccontaining an acidic solution and a basic solution, respectively. Out of three test tubes, the test tube containing basic solution will turn blue and is a basic solution. However, no change will be observed in acidic solution.
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