A-LevelChemistryGroup 29701/12 · Feb/Mar 2016 · Q181 Mark

River water in a chalky agricultural area contains Ca²⁺, Mg²⁺, CO₃²⁻, HCO₃⁻, Cl⁻ and NO₃⁻ ions. In a water treatment plant, such water is treated by adding a calculated quantity of calcium hydroxide. What will be precipitated from the river water following the addition of calcium hydroxide?

ACaCl₂

BCaCO₃

CCa(NO₃)₂

DMg(NO₃)₂

✓ Correct answer

B: CaCO₃

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