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Why does dry hydrogen chloride gas not turn dry blue litmus paper red?

Answer and explanation

Correct answer: No acidic ions form without water

Hydrogen chloride shows acidic behavior only after dissolving in water. In moist conditions, HCl reacts with water to form hydronium ions and chloride ions: HCl + H2O → H3O+ + Cl−. Hydronium ions cause blue litmus to turn red. Dry HCl gas and dry litmus provide no water for this ionisation, so no color change occurs. Hence option A is correct; HCl is not a base and can form an acid in water.

Related tags

Dry Hydrogen ChlorideLitmusHydronium IonsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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