Phosphate solution is treated with magnesia mixture (MgCl2, NH4Cl and aqueous NH3). The white crystalline double salt formed is

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Phosphate solution is treated with magnesia mixture ( $MgCl X_{2}$ , $NH X_{4} Cl$ and aqueous $NH X_{3}$ ). The white crystalline double salt formed is

Mg X^{2 +} + NH X_{4} X^{+} + PO X_{4} X^{3 -} MgNH X_{4} PO X_{4}

is the white crystalline ammonium magnesium phosphate. In the presence of

NH X_{4} Cl

the hydroxide does not precipitate, and no carbonate is present in the phosphate solution.