Article: Baking soda, baking powder and better gravy

Grace Bish, of Columbia, asks what the difference is between baking soda and baking powder, and whether they are interchangeable. Both are leavening agents, which means they help baked goods rise; but the two are used under different conditions. According to About Inc.s Web site, http://chemistry.about.com, heres the difference: Baking soda is pure sodium bicarbonate. When baking soda is combined with moisture and an acidic ingredient (such as yogurt or chocolate), the resulting chemical reaction produces bubbles of carbon dioxide that expand under oven temperatures ... The reaction begins immediately upon mixing the ingredients, so you need to bake recipes which call for baking soda ...

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