This is the balanced chemical equation for the reaction between sodium carbonate (Na2CO3) and hydrochloric acid (HCl) to form sodium chloride (NaCl), carbon dioxide (CO2), and water (H2O):

Na2CO3 + 2HCl → 2NaCl + CO2 + H2O

This equation shows that 1 mole of sodium carbonate reacts with 2 moles of hydrochloric acid to produce 2 moles of sodium chloride, 1 mole of carbon dioxide, and 1 mole of water.