Washing soda can be obtained by heating baking soda (sodium hydrogen carbonate), followed by recrystallization of sodium carbonate.

Sodium hydrogencarbonate, being alkaline, neutralizes excess acid in the stomach, providing relief from symptoms of acidity.

Sodium hydrogencarbonate is used in soda-acid fire extinguishers to generate carbon dioxide gas, which helps extinguish fires by displacing oxygen.

Sodium hydrogencarbonate is an ingredient in antacids, neutralizing excess acid in the stomach to provide relief from acidity.

Sodium carbonate is used as a precursor in the manufacture of sodium compounds like borax, serving as a key ingredient in the chemical reactions involved in their production processes.