O-LevelChemistryAcids, Bases & Salts5070/12 · May/June 2023 · Q231 Mark
The addition of calcium hydroxide to soil reduces its acidity but also reduces the efficiency of fertilisers. Which two equations explain this? 1 Ca(OH)2(s) + CO2(g) → CaCO3(s) + H2O(l) 2 Ca(OH)2(s) + 2H⁺(aq) → Ca²⁺(aq) + 2H2O(l) 3 Ca(OH)2(s) + 2NH4NO3(aq) → Ca(NO3)2(aq) + 2NH3(g) + 2H2O(l) 4 Ca(OH)2(s) + Cu²⁺(aq) → Cu(OH)2(s) + Ca²⁺(aq)
A1 and 2
B1 and 4
C2 and 3
D3 and 4
✓ Correct answer
C: 2 and 3
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