Why do acidic properties become clear when hydrogen chloride gas dissolves in water?
Answer and explanation
Correct answer: Because hydrogen ions form in water
Acidic properties in aqueous solution arise from hydronium ions, H₃O⁺, formed when an acid transfers a proton to water. Hydrogen chloride ionises in water: HCl + H₂O → H₃O⁺ + Cl⁻. These mobile ions account for acidic indicators, electrical conduction and reactions with bases. Dry HCl gas does not show the same aqueous acidic behaviour because water is needed for ion formation. Therefore option A expresses the correct reason; the other choices are chemically incorrect.
Frequently asked questions
What is the correct answer to this question?
Because hydrogen ions form in water
Why is this the correct answer?
Acidic properties in aqueous solution arise from hydronium ions, H₃O⁺, formed when an acid transfers a proton to water. Hydrogen chloride ionises in water: HCl + H₂O → H₃O⁺ + Cl⁻. These mobile ions account for acidic indicators, electrical conduction and reactions with bases. Dry HCl gas does not show the same aqueous acidic behaviour because water is needed for ion formation. Therefore option A expresses the correct reason; the other choices are chemically incorrect.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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