Does Baking Powder Expire?
Yes, baking powder loses potency over time and should be replaced every 6-12 months after opening. Unopened baking powder lasts 18 months to 2 years. Unlike baking soda, baking powder contains acid that degrades. Test it by adding to hot water - it should bubble vigorously. Related: Difference between baking soda and baking powder.
Key Takeaways
- Baking powder is a leavening agent that contains baking soda, an acid (usually cream of tartar), and a buffer (usually cornstarch).
- Double-acting baking powder is more forgiving than single-acting but still expires.
- Humid climates may require more frequent replacement of baking powder.
Explanation
Baking powder is a leavening agent that contains baking soda, an acid (usually cream of tartar), and a buffer (usually cornstarch). Over time, the acid and base slowly react, reducing the powder's effectiveness at making baked goods rise.
Exposure to moisture and humidity accelerates this degradation. Once opened, baking powder should be stored in a cool, dry place with the lid tightly sealed. Even unopened containers slowly lose potency after the expiration date.
To test baking powder freshness, stir 1 teaspoon into 1/3 cup of hot water. Fresh baking powder will immediately bubble vigorously. If it fizzes weakly or not at all, replace it. Using expired baking powder results in flat, dense baked goods.
Things to Know
- Double-acting baking powder is more forgiving than single-acting but still expires.
- Humid climates may require more frequent replacement of baking powder.
- Aluminum-free baking powder has the same shelf life as regular baking powder.