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A substance dissolves in water, turns red litmus blue, and feels soapy. Which ion will mainly be present?

Answer and explanation

Correct answer: Hydroxide ion

The governing concept is the identification of bases through their properties and ions in aqueous solution. A base changes red litmus to blue and often feels slippery or soapy, indicating the presence of hydroxide ions, OH⁻, in water. Therefore option A is correct. Hydrogen ions are associated with acidic solutions and would turn blue litmus red. Chloride ions alone are not responsible for basicity, and carbonate is not always the principal ion in every base.

Related tags

Hydroxide IonBasesLitmus TestAcidsAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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