Baking Powder

October 21, 2012

Baking powder is a two-part chemical leavening agent.  Baking soda and cream of tartar react in solution to evolve carbon dioxide.  Cornstarch present in the mixture absorbs water to prevent this reaction from occurring prematurely.

The two parts are always itching to react.  Be sure to use baking powder within six months of purchase; its efficacy degrades over time.

Double-acting baking powder includes a second acid salt to produce a second leavening at a high temperature.  High-temperature acid agents could be sodium acid pyrophosphate, sodium aluminum phosphate and sodium aluminium sulfate.

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