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Report Abuse. Baking powder and baking soda are almost the same thing, but baking powder has a heat activated acid that causes it to produce CO2 when its in the oven. hence the term 'doulbe acting'. Powder also needs an acid to activate it. Baking soda is used mainly for adjusting the pH of a baked good.
For one teaspoon baking powder = mix 1/2 teaspoon cream of tartar plus 1/4 teaspoon baking soda. Learn about the History of Baking Powder. Baking Powder is a leavening agent that consists of a combination of baking soda, cream of tartar, and a moisture absorber (like cornstarch).