Question
While playing in a park, a child was stung by a wasp. Some elders suggested applying paste of baking soda and others lemon juice as remedy. Which remedy do you think is appropriate and why?
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Answer
Wasp sting inject a liquid in the skin which is acidic in nature. Hence, baking soda is the appropriate remedy as it is basic in nature and neutralises the acid.
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(i) Both acids and bases change colour of all indicators.
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(iii) If an indicator changes colour with a base, it does not change colour with an acid.
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