CH-1084
Neutralisation
Chemistry · Secondary 4 · Hard · Neutralisation
Calcium hydroxide is added to acidic soil that has been treated with ammonium sulfate fertiliser, (NH₄)₂SO₄.
Which equation shows why this can reduce the effectiveness of the fertiliser?
1. Ca(OH)₂ + 2H⁺ → Ca²⁺ + 2H₂O
2. Ca(OH)₂ + CO₂ → CaCO₃ + H₂O
3. Ca(OH)₂ + (NH₄)₂SO₄ → CaSO₄ + 2NH₃ + 2H₂O
4. Ca(OH)₂ + SO₄²⁻ → CaSO₄ + 2OH⁻
Which equation shows why this can reduce the effectiveness of the fertiliser?
1. Ca(OH)₂ + 2H⁺ → Ca²⁺ + 2H₂O
2. Ca(OH)₂ + CO₂ → CaCO₃ + H₂O
3. Ca(OH)₂ + (NH₄)₂SO₄ → CaSO₄ + 2NH₃ + 2H₂O
4. Ca(OH)₂ + SO₄²⁻ → CaSO₄ + 2OH⁻
- 1 only
- 2 only
- 3 only
- 1 and 3
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