![Explain why Magnesium ions form precipitate with dilute ammonia solution, but no precipitates is formed if ammonium chloride is added to magnesium ions prior to ammonia solution Explain why Magnesium ions form precipitate with dilute ammonia solution, but no precipitates is formed if ammonium chloride is added to magnesium ions prior to ammonia solution](https://digitalteachers.co.ug/wp-content/uploads/2022/09/Bbosa-Science.png)
Explain why Magnesium ions form precipitate with dilute ammonia solution, but no precipitates is formed if ammonium chloride is added to magnesium ions prior to ammonia solution
Ammonia hydrolyses in water to hydroxyl ions
NH3 (aq) + H2O (l) → NH4+(aq) + OH–(aq)
Hydroxyl ions react with magnesium ions to form white ppt. of magnesium hydroxide
Mg2+(aq) + 2OH–(aq) → Mg(OH)2(s)
In presence of ammonium chloride magnesium ions do not form ppt. the hydroxyl ions are neutralized by ammonium ions
NH4+ (aq) + OH– (aq) → NH3 (aq) + H2O(l)
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Dr. Bbosa Science
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