WAEC SSCE - Chemistry - 2004 (Objective)

Ibeere 1 Ìròyìn

When ammonium trioxocarbonate (IV) solution is added to separate solutions of calcium, zinc and sodium salt precipitate could be formed in the case of

calcium only

zinc only

calcium and znic only Ìdáhùn tó tọ́

sodium and zinc only

Awọn alaye Idahun

When ammonium trioxocarbonate (IV) solution is added to separate solutions of calcium, zinc and sodium salt, precipitates could be formed in the case of calcium and zinc only. The ammonium trioxocarbonate (IV) solution reacts with the calcium and zinc ions in the solutions to form insoluble carbonates as follows: Ca²⁺ + CO₃^2- → CaCO_3(s) Zn²⁺ + CO₃^2- → ZnCO_3(s) These carbonates are insoluble in water and will form precipitates in the solutions. The sodium ion does not react with the ammonium trioxocarbonate (IV) solution and therefore, no precipitate will be formed in its solution.






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