Na20 → NaHCO3 → Na2C03 → NaOH → NaH2PO4→ Na3PO4;

The reaction you provided seems to depict a series of chemical transformations involving sodium compounds. Each arrow likely represents a chemical reaction where the reactant on the left side undergoes a reaction to form the product on the right side.

Here is a breakdown of the reactions based on the compounds involved:

1. Na2O (Sodium oxide) reacts with CO2 (carbon dioxide) and H2O (water) to form NaHCO3 (Sodium bicarbonate or baking soda).

2. NaHCO3 decomposes into Na2CO3 (Sodium carbonate) upon heating, releasing CO2 and H2O as byproducts.

3. Na2CO3 reacts with a strong acid to form NaOH (Sodium hydroxide), which is a base.

4. NaOH can react with phosphoric acid (H3PO4) to produce NaH2PO4 (Sodium dihydrogen phosphate).

5. NaH2PO4 can further react to form Na3PO4 (Sodium phosphate).

If you need more information or have any specific questions about these reactions, feel free to ask!