In terms of quality, baking soda is lighter than soda ash.

Judging from the reaction with HCL, baking soda reacts faster than soda ash.

In terms of stability, baking soda is easy to decompose when heated.

In terms of alkalinity, the hydrolysis of baking soda is weakly alkaline, and the hydrolysis of soda ash is alkaline.

From the appearance, baking soda is white fine crystal, while soda ash is white powder.