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Carbon and Its Compound
What change will you observe if you test soap with litmus paper (red and blue)?
Litmus paper is an indicator that is used to check the acidic or alkaline nature of the substance. An alkaline solution converts red litmus paper to blue while an acidic solution converts blue litmus paper to red.
Soap is formed by the combination of fatty acid and sodium hydroxide. This means that it is a basic salt that is formed by the reaction of a weak acid and a strong base. So, soap will convert red litmus paper to blue but show no change in blue litmus paper.
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