The balanced reaction for phosphoric acid (H₃PO₄) and sodium hydrogen carbonate (NaHCO₃) is:

H₃PO₄ (aq) + 3 NaHCO₃ (aq) → Na₃PO₄ (aq) + 3 CO₂ (g) + 3 H₂O (l)

Here's a breakdown:

* Reactants:

* H₃PO₄ (aq): Phosphoric acid, dissolved in water.

* NaHCO₃ (aq): Sodium hydrogen carbonate (baking soda), dissolved in water.

* Products:

* Na₃PO₄ (aq): Sodium phosphate, dissolved in water.

* CO₂ (g): Carbon dioxide gas.

* H₂O (l): Water.

This reaction is an example of an acid-base reaction where the acidic phosphoric acid reacts with the basic sodium hydrogen carbonate. The reaction produces carbon dioxide gas, which is why it's often used in baking recipes.