Here's why:

* Ionic compounds are formed by the electrostatic attraction between positively charged ions (cations) and negatively charged ions (anions).

* Baking soda (sodium bicarbonate, NaHCO₃) is composed of:

* Sodium ions (Na+): These are positively charged.

* Bicarbonate ions (HCO₃-): These are negatively charged.

The strong electrostatic forces between these oppositely charged ions hold the compound together, making it an ionic compound.