AQA · Year 13
AQA Aqua Ion Reaction Questions
Practise the observations, equations and excess-reagent behaviour of Fe²⁺, Fe³⁺, Cu²⁺ and Al³⁺ aqua ions.
Work it out, then check
Question 1 of 6
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Worked answer
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Keep the initial reaction separate from what happens in excess reagent. Aluminium hydroxide dissolves in excess hydroxide; the copper(II) precipitate dissolves in excess ammonia to form a deep-blue complex. Carbonate behaves differently with the more acidic 3+ aqua ions.
A worked example
Adding carbonate to Fe³⁺ aqua ions gives a brown hydroxide precipitate and CO₂. It does not follow the simple Fe²⁺ carbonate-precipitation pattern.