A mixture of sodium bicarbonate and tartaric acid is called _____________ .

Baking soda:

• Baking soda is a mixture of sodium $\mathrm{Hydrogen}\mathrm{carbonate}\left({\mathrm{NaHCO}}_3\right)$ and tartaric acid. It is used to increase the volume in baking.
• Solvay process is used for the production of $\mathrm{Sodium}\mathrm{bicarbonate}\left({\mathrm{NaHCO}}_3\right)$ and $\mathrm{Sodium}\mathrm{carbonate}\left({\mathrm{Na}}_2{\mathrm{CO}}_3\right)$ industrially.
• In this process $\mathrm{Carbon}\mathrm{dioxide}\left({\mathrm{CO}}_2\right)$, $\mathrm{Water}\left({\mathrm{H}}_2\mathrm{O}\right)$, $\mathrm{ammonia}\left({\mathrm{NH}}_3\right)$ and brine solution $(\mathrm{aquas}\mathrm{NaCl})$in its concentrated form, are used as raw materials.

Thus, A mixture of sodium bicarbonate and tartaric acid is called baking soda.