DebPC
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To test if your baking powder is still good, you can mix 1 teaspoon of baking powder with 1/3 cup of hot water. If it bubbles vigorously, it's still good to use. If it doesn't bubble at all, it's time to replace it.
Yes, baking powder does expire. It usually has a shelf life of about 6 months to 1 year, depending on the brand. After that, it will start to lose its potency and won't work as well in your baked goods.
Technically, you can still use expired baking powder, but it may not give you the desired results in your baked goods. It's best to replace it with a fresh batch to ensure your recipes turn out correctly.
Baking powder should be stored in a cool, dry place in an airtight container. Exposure to moisture or humidity can cause it to clump and lose its effectiveness.
No, baking soda and baking powder are not interchangeable. Baking powder contains an acid, which helps to create a reaction and make your baked goods rise. Baking soda requires an additional acid to activate it, so it's best to use the type of leavening agent specified in your recipe.