Write down the reaction equations that can be used to carry out the following transformations: H2O → O2 → P2O5 → H3PO4 → Na3PO4. Indicate in each case the type of chemical reaction.
1. Decomposition reaction. Water electrolysis.
2H2O = 2H2 + O2.
2. The reaction of the connection. Burning phosphorus in excess dry air.
P4 + O2 = P4O10.
3. Reaction of the connection. Dissolution of oxide in water to form phosphoric acid.
P2O5 + 3H2O = 2H3PO4.
4. Reaction of exchange. Acid and alkali.
3NaOH + Н3РО4 = Na3PO4 + 3H2O.
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