baking soda 
noun [mass noun]
Sodium bicarbonate used in cooking, for cleaning, or in toothpaste.Sift together the flour, baking powder, baking soda, salt and cinnamon....
- In a medium bowl, combine the rest of the flour with the rest of the baking powder and baking soda, and all of the chopped pistachios.
- Products like cornmeal, baking soda and cornstarch are also not allowed.