Which substance provides hydrogen ions to show acidic properties when dissolved in water?
Answer and explanation
Correct answer: Hydrogen chloride
The governing concept is the ionisation of acids in aqueous solution. Hydrogen chloride, HCl, dissolves in water and forms hydronium ions, represented at school level as hydrogen ions: HCl + H₂O → H₃O⁺ + Cl⁻. These aqueous hydrogen or hydronium ions are responsible for acidic properties. Sodium hydroxide supplies hydroxide ions, while calcium oxide and sodium carbonate produce basic or alkaline solutions in water. Therefore option B is correct.
Frequently asked questions
What is the correct answer to this question?
Hydrogen chloride
Why is this the correct answer?
The governing concept is the ionisation of acids in aqueous solution. Hydrogen chloride, HCl, dissolves in water and forms hydronium ions, represented at school level as hydrogen ions: HCl + H₂O → H₃O⁺ + Cl⁻. These aqueous hydrogen or hydronium ions are responsible for acidic properties. Sodium hydroxide supplies hydroxide ions, while calcium oxide and sodium carbonate produce basic or alkaline solutions in water. Therefore option B is correct.
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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