How does baking powder work?

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Baking is one of our favourite family activities. In fact, we like baking cakes and biscuits and breads almost as much as we like eating them! My daughters are getting pretty good at following a recipe and measuring out the ingredients that we need to use.

Many of the cake and biscuit recipes we use ask for baking powder or bicarbonate of soda. My girls want to know what these same-looking, white-powdery ingredients are made of and what is their job in baking?

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