They have different smells, different properties, and different uses.

1. The smell of baking soda is very bland, while the smell of soda is pungent and has an obvious irritating smell.

2. Baking soda is unstable in nature and easily decomposes when exposed to heat. Soda is stable in nature and does not decompose when exposed to heat.

3. Baking soda can be used for cleaning and disinfecting. Soda can be used to relieve indigestion symptoms such as heartburn and acid reflux.