Sodium carbonate cannot be used in place of a | vedclass

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(D) . The fifth group radicals $(Ba^{2+}, Sr^{2+}, Ca^{2+})$ are precipitated as carbonates using $(NH_4)_2CO_3$ in the presence of $NH_4Cl$ and $NH_4

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Magnesium will be precipitated

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(D) . The fifth group radicals $(Ba^{2+}, Sr^{2+}, Ca^{2+})$ are precipitated as carbonates using $(NH_4)_2CO_3$ in the presence of $NH_4Cl$ and $NH_4OH$.When $(NH_4)_2CO_3$ is used,the concentration of $CO_3^{2-}$ ions is kept low due to the common ion effect of $NH_4^+$.However,if $Na_2CO_3$ is used,the concentration of $CO_3^{2-}$ ions becomes very high.This high concentration of $CO_3^{2-}$ causes $Mg^{2+}$ ions (which belong to the $VI^{th}$ group) to precipitate as $MgCO_3$ along with the $V^{th}$ group radicals,thus interfering with the analysis.

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

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