Baking soda is sodium bicarbonate that produces carbon dioxide in a batter with acidic ingredients. Baking powder combines bicarbonate with an acid component, so the two are not interchangeable measure for measure. Check what the recipe contains and follow a tested formula before substituting. University of Illinois Extension’s comparison explains the kitchen distinction, while a food-science professor at Washington State University describes the underlying reaction.

How the two leaveners react

Baking soda has no acid of its own, so it needs an acidic ingredient and moisture in the batter to react. Yogurt, buttermilk, and lemon juice are examples, but naming an ingredient does not tell you how much acid is available or how much bicarbonate would balance it. Baking powder includes an acid component and can produce gas when it meets liquid. Ingredients and reaction timing vary by formulation, so do not assume every product has the same two-stage action. King Arthur Baking’s guide also explains why a recipe may use both: their jobs can include managing acidity and providing lift.

A practical recipe check

  • 1. Read the ingredient list and note whether it calls for baking soda, baking powder, or both. If both appear, record each amount separately.
  • 2. Look for ingredients that may be acidic, such as yogurt or lemon juice. This helps explain the formula; it does not mean you can add extra soda.
  • 3. Check the package ingredients and the recipe’s units. A teaspoon and a gram measure different things, so matching numerals do not mean matching quantities.
  • 4. If you must substitute, find guidance for the specific recipe and product. If you cannot verify a suitable method, get the listed ingredient or choose another tested recipe instead of guessing.

A hypothetical example and common mistake

Suppose a pancake recipe calls for one teaspoon of baking powder, but you have only baking soda. The presence of yogurt in the batter is not enough information to replace it with one teaspoon of soda. Without the yogurt amount and acidity, the flour-to-liquid balance, and the product formulation, you cannot calculate a suitable soda amount. If a recipe lists both leaveners, do not treat one as a duplicate; each may have a different role.

Limits when judging the result

A flat or bitter bake does not identify the leavener as the only cause. Measuring, delay after mixing, oven temperature, and other ingredients can also affect the result. This is a guide to reading a formula, not a baking experiment or a universal substitution chart. Follow the package’s storage guidance; a quick fizz test alone cannot guarantee how a product will perform in a particular batter.

The manufacturer describes the acid component in baking powder and notes that formulations can differ. the manufacturer’s ingredient guide