Which experiment proves that hydrogen chloride shows acidic properties after dissolving in water?
Answer and explanation
Correct answer: Moist blue litmus turns red
Hydrogen chloride gas itself does not release hydrogen ions effectively without water. When it dissolves, HCl + H₂O → H₃O⁺ + Cl⁻, and the hydronium ions give the solution acidic properties. Moist blue litmus contains the needed water and therefore turns red. Dry blue litmus does not show this reliable change, red litmus turning blue indicates a base, and limewater milkiness is a carbon-dioxide test.
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What is the correct answer to this question?
Moist blue litmus turns red
Why is this the correct answer?
Hydrogen chloride gas itself does not release hydrogen ions effectively without water. When it dissolves, HCl + H₂O → H₃O⁺ + Cl⁻, and the hydronium ions give the solution acidic properties. Moist blue litmus contains the needed water and therefore turns red. Dry blue litmus does not show this reliable change, red litmus turning blue indicates a base, and limewater milkiness is a carbon-dioxide test.
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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