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Which experiment proves that water is needed to show acidic properties?

Answer and explanation

Correct answer: Dry hydrogen chloride having no effect on dry litmus

The relevant experiment compares dry hydrogen chloride with hydrogen chloride dissolved in water. Dry HCl gas does not change the colour of dry litmus because ions cannot move or form effectively without an aqueous medium. When HCl dissolves in water, it ionises to H₃O⁺ and Cl⁻, and the hydronium ions produce acidic behaviour. Thus the lack of effect on dry litmus demonstrates the need for water.

Related tags

Dry-Hydrogen-ChlorideLitmusWaterIonisationAcidic-PropertiesAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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