For the analysis of Group V cations ( Ba 2 + , Sr 2 + , Ca 2 + ) , ( NH 4 ) 2 CO 3 is used in the presence of NH 4 Cl and NH 4 OH . If the concentration of NH 4 Cl is too low:

Question

For the analysis of Group V cations ( Ba 2 + , Sr 2 + , Ca 2 + ) , ( NH 4 ​ ) 2 ​ CO 3 ​ is used in the presence of NH 4 ​ Cl and NH 4 ​ OH . If the concentration of NH 4 Cl is too low:

TestHub · Accepted Answer

Concept: Ionic product control in Group V.

Solution:

$N H_{4} Cl$ suppresses the concentration of $C O_{3}^{2 -}$ (via $N H_{4}^{+}$ ) and $O H^{-}$ (common ion effect). If the $N H_{4} Cl$ concentration is low, the $C O_{3}^{2 -}$ concentration becomes high enough to exceed the $K_{s p}$ of $M g C O_{3}$ .

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