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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.
The purpose behind baking powder and baking soda is to react with the ingredients in your batter and release carbon dioxide gas. Ideally, these gases will meet up with bubbles that you've made in your batter by whisking or beating, make them larger, and provide some lift in your baked goods.aking soda is alkaline, and it reacts with any acidic ingredients in your batter (such as buttermilk or lemon juice). The baking soda neutralizes some or all of the acid, and in the process releases the carbon dioxide we mentioned before.