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Question
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?
Solution 1
- If the colour of red litmus does not change then it is acid.
- If the colour of red litmus changes to blue then it is base.
- If there is slight change in the colour of red litmus (such as purple) then it is distilled water.
Solution 2
Using the red litmus paper, we can identify the content in each of the test tube. This can be done by noticing the color change of the red litmus paper.
- If the red litmus paper changes to blue color it means that, the solution is a basic solution.
- If we put the changed litmus paper into another solution to see if it changes to red again. If it does change that means that solution will be an acidic solution.
- The solution that has no change in any of the litmus paper will be the neutral solution therefore that will be the distilled water.
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