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Group V Cations Analysis Simulator

Group V Cations Analysis Simulator

Group V Cations Analysis

Precipitation of Ba2+, Sr2+, and Ca2+ using (NH4)2CO3.

1. Setup Experiment

Select Unknown Filtrate
0
1
2
3

2. Observation

Physical State Clear Solution
Status: Standby.

Assume the filtrate from Group IV. In Step 1, Ammonium Carbonate is added to the ammoniacal solution to precipitate alkaline earth metals.

3. Chemical Principles

1. Precipitation: (NH4)2CO3 precipitates the carbonates of Ba, Sr, and Ca. NH4Cl is present to suppress the ionization of (NH4)2CO3, preventing the precipitation of MgCO3 (Group VI) which has a higher Ksp.
M2+ + CO32- → MCO3↓
2. Dissolution: The carbonates dissolve easily in hot, dilute Acetic Acid, releasing CO2 gas.
MCO3 + 2CH3COOH → M(CH3COO)2 + H2O + CO2↑

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