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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.
What is baking powder? Baking powder is a chemical leavening agent that causes baked goods to rise by releasing bubbles of carbon dioxide gas into a batter or dough. It is double acting, meaning that it acts once when moisture is added and again when heat is applied. This allows baking powder to give an extra lift to baked goods that contain it.