Why is a precipitate of magnesium carbonate not fomred along with the carbonates of Ba, Sr and Ca in group V?

Explanation

### Step-by-Step Solution:

1. **Understanding the Group V Precipitation**: In qualitative inorganic analysis, Group V consists of carbonates of barium (Ba), strontium (Sr), calcium (Ca), and magnesium (Mg). When a solution containing these cations is treated with ammonium carbonate, we expect to see the formation of precipitates.

2. **Formation of Carbonate Precipitates**: Barium carbonate (BaCO₃), strontium carbonate (SrCO₃), and calcium carbonate (CaCO₃) are known to precipitate easily when carbonate ions are present in sufficient concentration. However, magnesium carbonate (MgCO₃) behaves differently.

3. **Role of Ammonium Chloride**: In the presence of ammonium chloride (NH₄Cl), the ionization of ammonium carbonate (NH₄)₂CO₃ is suppressed. Ammonium chloride dissociates into ammonium ions (NH₄⁺) and chloride ions (Cl⁻), which affects the availability of carbonate ions (CO₃²⁻) in the solution.

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