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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 is a base and and reacts with vinegar, the acid. Combining the two ingredients creates an immediate reaction of carbon dioxide bubbles. Baking powder contains baking soda that is already combined with an acid. To activate the chemical reaction with baking powder, all that is needed is moisture.