Question

You are given three test-tubes which contain an acidic solution, a basic solution and distilled water, separately. If you are provided only red litmus paper, how will you identify the contents of each test-tube?

Answer 1

We seperately dip red litmus paper in three solutions, the basic solution will turn red litmus to blue. After that we use that blue litmus in other two solutions to test acidic solution, when we dip blue litmus in two solutions acidic solution will turn blue litmus to red and the remaining solution will be distilled water.