Question

$MgSO_4$ on reaction with $NH_4OH$ and $Na_2HPO_4$ forms a white crystalline precipitate. What is its formula?

• A. $Mg(NH_4)PO_4$
• B. $Mg_3(PO_4)_3$
• C. $MgCl_2 . MgSO_4$
• D. $MgSO_4$

Answer 1

Answer: (A)

$Mg(NH_4)PO_4$

Answer 2

Magnesium ammonium phosphate is precipitated out
$MgSO_4 + NH_4OH + Na_2HPO_4 \rightarrow Mg(NH_4)PO_4 \downarrow + Na_2SO_4$