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But it can make a big difference for baked goods, so let's explain. Baking soda has only one ingredient: sodium bicarbonate. Sodium bicarbonate is a base that reacts when it comes into contact with acids, like buttermilk, yogurt or vinegar.
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baking powder contains sodium bicarbonate,but it also includes the acidifying agent-tartar and the drying agent starch.baking powder is available in both single and double active tendencies

baking soda is pure sodium bicarbonate.

i hope it helps....