From Diffen
| Baking Powder | Baking Soda | ||
|---|---|---|---|
| Ingredients: | Sodium Bicarbonate, cream of tartar (acidifying agent), starch (drying agent) | Sodium bicarbonate |
Both baking soda and baking powder are leavening agents (an ingredient that produces a gas which causes batters and doughs to rise.
[edit] Use
Baking soda is simply sodium bicarbonate, which does not have any leavening capabilities by itself. It is only when baking soda is mixed with an acid such as sour cream, molasses, lemon juice, or buttermilk that these gases are released. Because these gases start forming right after the baking soda and acid are mixed, batters using baking soda should be baked immediately after mixing.
Baking powder actually consists of baking soda and an acid, usually cream of tartar, calcium acid phosphate, sodium aluminum sulfate, or a mixture of the three.
Baking powder is available as single-acting baking powder and as double-acting baking powder. Single-acting powders are activated by moisture, so you must bake recipes which include this product immediately after mixing. Double-acting powders react in two phases and can stand for a while before baking. With double-acting powder, some gas is released at room temperature when the powder is added to dough, but the majority of the gas is released after the temperature of the dough increases in the oven.
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