Let us write down the reaction equations for a given chain of compounds.
P2O5 -> H3PO4 -> Na3PO4 -> Ca3 (PO4) 2.
P2O5 + 3H20 = 2H3PO4.
Reaction refers to the reactions of a compound to form phosphoric acid.
H3PO4 + 3NaOH = Na3PO4 + 3H2O.
Reaction refers to an exchange or neutralization reaction. With the formation of water and sodium phosphate.
Na3PO4 + 3Ca (OH) 2 = Ca3 (PO4) 2 + 3NaOH.
Reaction refers to exchange reactions. This reaction produces calcium phosphate and sodium hydroxide.
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