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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.
Baking Soda vs Baking Powder. While baking soda is strictly an alkaline compound, baking powder is sodium bicarbonate already combined with an acid. The acid compound in baking powder is in the form of a salt, which means it will not react with the base until a liquid is added. Baking soda is good to use in recipes which include other acidic ingredients. If a recipe does not contain enough acids, using baking powder is appropriate as it contains its own acid.