How is sodium bicarbonate connected to sodium chloride and baking powder?

Sodium bicarbonate is chemically linked to sodium chloride primarily through the Solvay process, an industrial method used to produce sodium bicarbonate. In this process, carbon dioxide is passed through a concentrated solution of sodium chloride and ammonia to precipitate sodium bicarbonate. Consequently, sodium chloride serves as a fundamental raw material for the production of many other sodium compounds.12

Regarding its role in baking powder, sodium bicarbonate acts as a primary leavening agent. Baking powder is a mixture composed of sodium bicarbonate (a base) and a weak [acid]. When these ingredients are combined in a batter or dough, they react to release carbon dioxide gas, which creates the light, porous structure characteristic of baked goods. Because sodium bicarbonate is a source of this gas, it is an essential component of the baking powder mixture.312