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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. Baking powder is a combination of baking soda and a powdered acid. For these tests, Davis double-acting baking powder was used, as purchased from the local grocery store. This contains cornstarch as a filler, sodium bicarbonate, calcium phosphate, and sodium aluminum sulfate.aking Powder. Baking powder is a combination of baking soda and a powdered acid. For these tests, Davis double-acting baking powder was used, as purchased from the local grocery store. This contains cornstarch as a filler, sodium bicarbonate, calcium phosphate, and sodium aluminum sulfate.