If I have been provided with 3 test tubes one of them contains disstiled water and the other two contains acidic and basic solutions respectively. If I was given only red litmus paper, how will I know the contents of the test tubes?
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Solution
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.