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Why does dry hydrochloric acid gas not change the colour of dry litmus paper?

Answer and explanation

Correct answer: Water is absent

The governing concept is that hydrochloric acid shows acidic behaviour only after ionisation in water. Dry hydrogen chloride gas cannot provide hydrogen ions to dry litmus because there is no water to form hydronium ions. Therefore option A is correct. The acid is present, the litmus need not be damaged, and hydrogen chloride is not a basic gas; the missing condition is moisture.

Related tags

Hydrogen ChlorideDry LitmusIonisationAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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