Baking Powder vs. Baking Soda
Baking soda is a base that requires an acidic ingredient—like buttermilk, yogurt, or lemon juice—to trigger the chemical reaction that lifts your dough. Baking powder contains both the base and the acid in a single powder, meaning it only needs moisture and heat to create bubbles. Use soda when your recipe already has a distinct acidic component; use powder when it does not.
Testing for freshness is the only way to be sure.
Leavening agents lose their potency over time. If you aren't sure how long that tin has been sitting in your cupboard, test it before you commit to a full batch of dough.
- small glass
- teaspoon
What goes in.
- 1/2 tspbaking soda
- 1/2 tspbaking powder
- 1/4 cupvinegar (for testing)
- 1/4 cuphot water (for testing)
Checking your leavening power
Drop a half-teaspoon of baking soda into vinegar; it should fizz violently immediately. Drop a half-teaspoon of baking powder into hot water; it should bubble steadily. If nothing happens, the leavener is dead.
The method.
Check the ingredient list for acids
Look for molasses, brown sugar, cocoa powder, buttermilk, sour cream, or citrus. If these appear in significant amounts, baking soda is your primary leavening agent.
Evaluate the need for baking powder
If your recipe relies on neutral ingredients like milk, water, or flour, baking powder is necessary because it provides its own internal acid source.
Respect the ratio
Adding too much of either will result in a metallic or soapy aftertaste and a cake that collapses in the oven because the air bubbles become too large and pop.
When it doesn't go to plan.
Store both in a cool, dry place away from the oven to keep them from clumping.
If a recipe calls for baking powder, you can make your own by whisking one part baking soda with two parts cream of tartar.
Baking soda is roughly three to four times stronger than baking powder, so they are not interchangeable at a one-to-one ratio.
The ones that keep coming up.
Can I use baking powder instead of baking soda?
Generally, no. You would need significantly more baking powder to get the same lift, which will ruin the flavor of your bake.
Why did my cookies turn out flat?
Your baking soda or powder was likely expired, or the leavener was not distributed evenly through your dry ingredients.
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