Is baking soda heterogeneous or homogenous?

Baking soda, also known as sodium bicarbonate (NaHCO3), is a homogeneous substance. Homogeneous substances are those in which the composition and properties are uniform throughout. In the case of baking soda, it is composed of sodium, hydrogen, carbon, and oxygen atoms in a fixed proportion. Regardless of the amount or location of baking soda taken, the composition and properties remain the same, making it a homogeneous substance.