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A student dipped blue litmus paper in vinegar, and it turned red. What is the correct reason for this change?

Answer and explanation

Correct answer: Ethanoic acid present in vinegar is acidic

Vinegar is an aqueous solution containing ethanoic acid, CH₃COOH. Acids provide hydrogen ions in water and change blue litmus to red, so the observed colour change is evidence of the acidic nature of ethanoic acid. Ethanol is not a base and does not cause this result. Carbon dioxide is not the relevant explanation for vinegar’s test, and blue litmus does not require heating to change in an acid. Thus, option A is correct.

Related tags

Class 10 ScienceAcids Bases SaltsEthanoic AcidLitmus TestAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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