Table 5.

The precipitation of insoluble magnesium phosphates. The activity products (Q) and the solubility products K_sp (at 38 °C) are obtained from the literature.

	Formula	Activity Product (Q)	Solubility Product, Ksp at 38 °C	Ref.
Babierrite	Mg3(PO4)2·8H2O	{Mg2+}3 {PO43−}2	6.31 × 10−28	[152]
			5.37 × 10−26 *†‡	[144]
			2.00 × 10−26 §	[153]
Newberyite	Mg(HPO4)·3H2O	{Mg2+} {HPO42−}	3.47 × 10−5	[154]
			1.78 × 10−6 *†	[144]
			2.40 × 10−6 ‡	[144]
			1.78 × 10−6 §	[155]
			1.48 × 10−6 §	[153]
Magnesium potassium phosphate	KMgPO4·6H2O	{K+} {Mg2+} {PO43−}	2.4 × 10−11 §	[156]

* Values used in the calculations presented in this work; ^† recalculated based on [152]; ^‡ recalculated based on [154]; ^§ K_sp obtained at 25 °C.