Carry out the following transformation: P- P2O5- H3PO4- CA3 (PO4) 2

1) 4P + 5O2 = 2P2O5 (when phosphorus interacts with oxygen, phosphoric anhydride is formed, compound reaction);

2) P2O5 + 3H2O = 2H3PO4 (when phosphorus (V) oxide interacts with water, orthophosphoric acid is formed, compound reaction);

3) 2H3PO4 + 3Ca = Ca3 (PO4) 2 + 3H2 (when phosphoric acid interacts with calcium, calcium phosphate and hydrogen are formed, substitution reaction).



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