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?

NCERT Class 10th Science Chapter 2 Acids Bases and Salts



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In the three test tubes the test tube containing acid wont change its colour
and base changes frm red to blue and distillled water is neutral

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In case of distilled water there is a light change in color which indicates the presence of water.
For acid the red litmus paper does not change its color.
For base the red litmus paper changes to blue color.
These above observations are used to indicate the presence of substances.