A compound X of sodium forms a white powder. It is a constituent of baking powder and is used in some antacid prescriptions. When heated, X gives out a gas and steam. The gas forms a white precipitate with lime water. Write the chemical formula and name of X and the chemical equation for its decomposition on heating. What is its role in baking powder and in antacids?
(i) Compound X is baking soda (NaHCO3)
(ii) When heated, it gives sodium carbonate CO2 and water.
2NaHCO3 → Na2C03 + CO2 + H2O.
(iii) When used in baking powder and the salt is used a source of CO2. When added to the stomach this reaction occurs to neutralized axise.