how to check the freshness of baking powder

How to Check the Freshness of Baking Powder.
Baking powder is a leavening agent (something that helps doughs to rise) that’s often used in baked goods. Expired or old baking powder won’t create the same chemical reaction as fresh baking powder, and this means your bread, cookies, or other baked goods may not rise. When stored properly, baking powder can last for over a year, but if you're not sure if yours is still good, you can test it out before adding it to a recipe.

Part 1 Testing the Baking Powder.
1. Boil some tap water. Use tap water and fill a kettle to the minimum fill line. You only need ½ cup (118 ml) of hot water to test the baking powder, but filling the kettle to the minimum fill line will ensure the heating element doesn’t overheat. Turn on the kettle and bring the water to a boil.
Don’t use more water than you need, otherwise the kettle will waste energy heating the extra water.
2. Place some baking powder into a bowl. Measure 1 teaspoon (4.6 g) of baking powder into a heat-safe bowl, glass, or dish. Once the water has boiled, you'll pour it over the baking powder, so it’s important to use a dish that can withstand the heat.
You can actually use this same method to test the potency of baking soda as well.
3. Measure and pour the water. When the kettle boils, pour some of the boiling water into a half-cup measuring cup. Slowly pour the boiling water from the measuring cup over the baking powder.
To test baking soda instead of baking powder, add 1 teaspoon of white vinegar to the hot water before pouring it over the soda. The acid in the vinegar will react with the baking soda and activate it if it’s still good.
4. Watch for bubbling. Baking powder that’s still fresh and good to use will immediately start to bubble and fizz when you pour the boiling water over it. Fizzing and hissing means the baking powder is fresh and can be used as a leavening agent in baking.
The more bubbles the baking powder creates, the fresher it is.

Part 2 Finding Substitutions for Baking Powder.
1. Mix baking soda with cream of tartar. Baking powder is actually just baking soda mixed with a dry acid, so you can make your own baking powder in a pinch if what you have on hand isn't fresh. To make 1 tablespoon (14 g) of baking powder, whisk together 1 teaspoon (5 g) of baking soda and 2 teaspoons (7 g) of cream of tartar.
To make larger quantities of baking powder, mix baking soda and cream of tartar at a one-to-two ratio and store extras in an airtight container.
2. Combine baking soda and buttermilk. Another acid you can use to convert baking soda into baking powder is buttermilk. To make baking powder this way, combine ½ teaspoon (2 g) of baking soda with ½ cup (118 ml) of buttermilk. This baking powder alternative is best in recipes that already call for the buttermilk, such as:
Pancakes, Muffins, Biscuits, Waffles, Breading or batter, Doughnuts.
3. Mix baking soda with lemon juice or vinegar. Both lemon juice and vinegar contain acid that will help activate baking soda and turn it into baking powder. To make this alternative, combine ¼ teaspoon (1 g) of baking soda and 1 teaspoon (5 ml) of lemon juice or vinegar. This yields 1 teaspoon (5 g) of baking powder.


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