Analytical Chemistry Question 215

Question: The presence of magnesium is confirmed in the qualitative analysis by the formation of a white crystalline precipitate of

Options:

A) $ Mg{{( HCO_3 )}_2} $

B) $ MgNH_4PO_4 $

C) $ MgNH_4{{( HCO_3 )}_3} $

D) $ MgCO_3 $

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Answer:

Correct Answer: B

Solution:

[b] $ MgCl_2+Na_2HPO_4+NH_4OH\to $

$ \underset{whiteppt.}{\mathop{Mg(NH_4)}}PO_4+2NaCl+H_2O $