Chemistry in the Kitchen


What’s the difference between baking soda and baking powder?

Baking powder is a mixture of three things: baking soda, an acid, and a filler—usually cornstarch. The acid takes the place of the buttermilk or lemon juice in a recipe (see the previous question) to release CO2 from NaHCO3. The starch is in the mix to keep the two components from reacting before it gets into your cookies and to keep everything dry.


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