Na3PO4-->Ca3(PO4)2-->H3PO4

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Na3PO4 (sodium phosphate) can be converted to Ca3(PO4)2 (calcium phosphate) by a double displacement reaction. This reaction involves mixing a solution of Na3PO4 with a solution of CaCl2 (calcium chloride), which will result in the formation of solid Ca3(PO4)2 precipitate.

To convert Ca3(PO4)2 back to H3PO4 (phosphoric acid), you would need to perform a chemical reaction that breaks down the calcium phosphate into its individual components. One way to do this is by treating Ca3(PO4)2 with sulfuric acid (H2SO4) to form phosphoric acid and calcium sulfate (CaSO4) as byproducts. The chemical equation for this reaction would be:

Ca3(PO4)2 + 3H2SO4 -> 2H3PO4 + 3CaSO4

This reaction releases phosphoric acid (H3PO4) and calcium sulfate, which can be separated by filtration.