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Neither compound is soluble in water, however zinc phosphate will dissolve in acids while silicon dioxide will not, except for hydrofluoric acid. The reaction of zinc phosphate and the common acid hydrochloric acid is:
Zn3(PO4)2 + 6 HCl -----> 3 Zn+2 (aq) + 6 Cl- (aq) + 2 H3PO4 (aq).

All of the products from the reaction of zinc phosphate with hydrochloric acid are soluble in water. Therefore, the mixture of zinc phosphate and SiO2 only needs to be mixed with hydrochloric acid, stirred for 5 or 10 minutes and the liquid decanted off. To purify the remaining SiO2, it needs to be washed 3 to 5 times with pure water.
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