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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 Powder Substitutes. Baking Powder substitute. Substitutes for baking powder include using baking soda, but you must add additional ingredients. Several options are listed below. If you've run out of baking powder for your recipe or your baking powder has gone bad, check below to substitute for baking powder. You should substitute for baking powder and not just leave it out of the recipe in order to ensure that your baked goods rise properly. There are three types of baking powder: fast-acting, slow-acting and double-acting with double-acting being the most common type.