# Is baking soda a compound?

To a first approximation, $\text{baking soda}$ is a pure chemical compound.
The $\text{baking soda}$ you use to make cakes, i.e. the commercial product, is (pure?) $\text{sodium bicarbonate}$, i.e. Na^(+)""^(-)HCO_3.
$\text{Baking powder}$ is another leavening agent, but it contains $\text{cream of tartar}$, i.e. $\text{potassium ditartrate}$, $K {C}_{4} {H}_{5} {O}_{6}$, a salt of a diacid. When you add baking soda to a cake batter, the acid in the batter, the butter and the eggs, is conceived to react with the carbonate to make $C {O}_{2}$, which raises the cake, and makes it fluffy and spongy. Yumm.