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.
Frequently asked questions
What is the correct answer to this question?
Dry hydrogen chloride having no effect on dry litmus
Why is this the correct answer?
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.
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.
