In fifth group, `(NH_(4))_(2)CO_(3)` is added to precipitate out the carbonates. We do not add `Na_(2)CO_(3)` because:

In fifth group, `(NH_(4))_(2)CO_(3)` is added to precipitate out the carbonates. We do not add `Na_(2)CO_(3)` because:
A. `CaCO_(3)` is soluble in `Na_(2)CO_(3)`
B. `Na_(2)CO_(3)` increases the solubility of fifth group carbonates
C. `MgCO_(3)` will be precipitated out in fifth group
D. none

In fifth group, `(NH_(4))_(2)CO_(3)` is added to precipitate out the carbonates. We do not add `Na_(2)CO_(3)` because:

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