Myth: Baking Soda and Baking Powder Last Forever
True and false. Baking soda will live to see your 4-year-old get married. Baking powder has a shelf life of about a year. What’s the difference? Both are leavening agents, but baking powder contains an acid that allows it to react in recipes as soon as it gets wet, giving off the carbon dioxide that makes a cake rise. Baking soda has no acid; it relies on acids in the batter to activate it. If baking powder gets wet or is stored in a humid environment, its potency is diminished. To find out if your baking powder is still good, put some in a glass of water. If it bubbles, bake away. If not, head to the store.