Question

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

Answer 1

We can identify the test tube containing basic solution because red litmus paper turns blue when reacted to basic solution

Answer 2

Put the given red litmus paper in each of the three test tubes.The solution which turns the red litmus paper to blue is basic.

Now, put this blue litmus paper in the remaining two test tubes.The one which turns it red again is acidic.

The test tube which has no effect on either red or blue litmus paper is distilled water.