Na20 → NaHCO3 → Na2C03 → NaOH → NaH,PO, → → NagP04;

It seems like you are describing a series of chemical reactions starting with Na2O and ending with Na3PO4. Let's break down the reactions step by step:

1. Na2O (Sodium Oxide) reacts with water to form NaOH (Sodium Hydroxide): Na2O + H2O → 2NaOH

2. NaOH (Sodium Hydroxide) reacts with carbon dioxide to form sodium bicarbonate (NaHCO3): 2NaOH + CO2 → Na2CO3 + H2O

3. Na2CO3 (Sodium Carbonate) reacts with water to form sodium hydroxide (NaOH) and sodium bicarbonate (NaHCO3): Na2CO3 + H2O → 2NaOH + NaHCO3

4. NaOH (Sodium Hydroxide) reacts with phosphoric acid (H3PO4) to form sodium phosphate (Na3PO4) and water: 3NaOH + H3PO4 → Na3PO4 + 3H2O

So the overall reaction starting with Na2O and ending with Na3PO4 goes as follows: Na2O + H2O → 2NaOH 2NaOH + CO2 → Na2CO3 + H2O Na2CO3 + H2O → 2NaOH + NaHCO3 3NaOH + H3PO4 → Na3PO4 + 3H2O

I hope this helps you understand the series of reactions! If you have any further questions, feel free to ask.