When a solution of sodium hydrocarbonate (sodium hydrogen carbonate, NaHCO3) is heated, it undergoes thermal decomposition to form sodium carbonate (Na2CO3), carbon dioxide (CO2), and water (H2O). The equation for this reaction is: 2NaHCO3→heatNa2CO3+CO2+H2O2\text{NaHCO}_3\xrightarrow{\text{heat}}\text{Na}_2\text{CO}_3+\text{CO}_2+\text{H}_2\text{O}2NaHCO3heatNa2CO3+CO2+H2O Thus, heating sodium hydrocarbonate releases carbon dioxide gas, which can be observed as bubbling, and leaves behind sodium carbonate and water.