Other alkaline solutions
3 marks · EasyRead the passage and answer the questions below. Acids release hydrogen ions ([32mH^+[0m) in water, making the solution acidic.
Name the ion formed in solution when hydrochloric acid is added to water.
Give the symbol for this ion.
Explain, using the equation, what happens when [32mHCl[0m is dissolved in water.
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(a) Hydrogen ion
(b) H^+
(c) HCl(aq) → H^+(aq) + Cl^-(aq); explanation: HCl dissociates in water to form hydrogen ions and chloride ions.
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Marking points
B1 (a) · 1 mark · Correctly names 'hydrogen ion'.
B2 (b) · 1 mark · Gives correct symbol: H^+.
M1 (c) · 1 mark · Gives chemical equation and statement that HCl releases H^+ ions in water.
Worked solution
a) Hydrogen ion b) H^+ c) When hydrochloric acid dissolves in water:
The HCl breaks apart (dissociates) to form hydrogen ions and chloride ions.