Other alkaline solutions
2 marks · HardState the name and the full chemical formula of the ion that is present in all acidic solutions and causes acidity.
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Name: hydrogen ion; Formula: H^+
Also accept: Proton for name accepted; H+ with state symbol (aq) accepted; Hydronium ion or H3O+ not accepted
Common mistakes: Stating only the name or only the formula; Using the wrong charge or including incorrect elements
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Marking points
B1 · 1 mark · States the correct name: hydrogen ion (proton accepted).
B2 · 1 mark · Gives the correct formula: H^+ (state symbol (aq) accepted).
Worked solution
The ion present in all acidic solutions and responsible for acidity is the hydrogen ion.
Its chemical formula is H^+.