Question

Which of the following is(are) true when HCl (g) is passed through water? i.It does not ionise in the solution as it is a covalent compound. ii. It ionises in the solution. iii. It gives both hydrogen and hydroxyl ion in the solution. iv. It forms hydronium ion in the solution due to the combination of hydrogen ion with water molecule

Answer 1

Option D: It forms hydronium ions in the solution due to the combination of hydrogen ions with water molecules.

What is HCl and how does it ionize in water?

• Hydrochloric acid is formed by the combination of hydrogen and chlorine.
• It is a gas at normal room temperature but when dissolved in water it forms hydrochloric acid.
• It is one of the strong acids.
• When HCl is dissolved in water it dissociates into ions i.e hydrogen and chlorine ions.
• The equation of dissociation is given below.
• HCl    ⇌    H+ +     Cl-
• Thus, on dissociation, it gives off hydrogen ions which combines with water to form hydronium ion.

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