What is the chemical formula of sodium carbonate?

The correct answer is option 1. Na₂CO₃.

The chemical formula of sodium carbonate is \( Na_2CO_3 \).

Sodium carbonate is an inorganic compound composed of two sodium ions (\( Na^+ \)) and one carbonate ion (\( CO_3^{2-} \)). Therefore, the correct formula for sodium carbonate is \( Na_2CO_3 \). This compound is commonly known as soda ash or washing soda and is used in various industrial and household applications, such as in the production of glass, detergents, and water treatment.