Baking soda and baking powder are both leavening agents, which are substances used to help baked goods rise.
Baking soda becomes activated when it’s combined with both an acidic ingredient and a liquid. Upon activation, carbon dioxide is produced, which allows baked goods to rise and become light and fluffy. This is why recipes that include baking soda will also list an acidic ingredient, such as lemon juice or buttermilk.
Baking powder is a complete leavening agent, meaning it contains both the base (sodium bicarbonate) and acid needed for the product to rise. Cornstarch is also typically found in baking powder. It’s added as a buffer to prevent the acid and base from activating during storage.
Similarly to how baking soda reacts with water and an acidic ingredient, the acid in baking powder reacts with sodium bicarbonate and releases carbon dioxide once it’s combined with a liquid.
When a recipe calls for baking powder, it’s most likely referring to the double-acting kind. This means the powder creates two separate reactions: initially, when combined with liquid at room temperature, and secondly, once the mixture is heated.
For many recipes, an extended reaction is favorable, so the leavening, or rising, doesn’t happen all at once.
Baking Soda and Baking Powder
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