1.

Sodium carbonate cannot be used in place of ammonium carbonate for the precipitation of the fifth group radicals because

Answer»

SODIUM ions interfere with the DETECTION of fifth group radicals
Concentrations of CARBONATE ions is very low
Sodium will react with acidic radicals
Magnesium will be precipitated

Solution :When `(NH_(4))_(2)CO_(3)` is used then the concentration of `CO_(3)^(2-)` is comparatievely low but when `Na_(2)CO_(3)` is added then concentration of `CO_(3)^(2-)` increases so `Mg^(2+)` will be precipitated along with other V group radicals.


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