How to extinguish baking soda – popular and simple methods
Activating baking soda – sometimes called slaking or quenching – is a simple step that makes cakes and pastries rise light and fluffy. The soda reacts with an acidic ingredient, releases carbon dioxide and lifts the batter. You can activate it with white vinegar, lemon juice, buttermilk, sour cream or even boiling water, depending on what's in your recipe. The standard ratio is about 1 teaspoon of vinegar or 2 teaspoons of lemon juice per teaspoon of baking soda. I'll explain when activation is essential, when you can simply mix the soda into the flour, and why getting the proportions wrong leads to dense, flat results.
Why extinguish baking soda
Novice home cooks studying recipes carefully may notice the importance of adding properly slaked soda rather than dry powder. The soda can be extinguished in advance in a small bowl or directly within the dough during mixing. Why does this matter? The fluffiness of all baked goods depends on tiny gas bubbles that form during a chemical reaction between an alkaline ingredient (the baking soda) and an acidic one. The soda absolutely must be in an acidic environment to react properly, otherwise it remains chemically useless and contributes nothing to the rise of the bread.
How to choose baking soda
When choosing baking soda from the supermarket shelf, several questions naturally arise. To easily verify the quality of the product before buying, follow a few basic rules. First, check the production date on the packaging. Although baking soda has a long shelf life, fresher product always works more reliably, so aim for soda produced within the last twelve months. Second, the soda inside the package should feel loose and uniform without any clumps. Test by squeezing the package gently: if it feels hard or rocky, the soda has likely turned into a solid lump and should be left on the shelf. Third, you can test quality at home by sprinkling a tablespoon of soda onto a plate and squeezing fresh lemon juice over the top. A vigorous fizzing reaction confirms the soda is still active and good to use in baking.
How to extinguish soda with vinegar
Use ordinary table vinegar with a concentration of no more than 9 percent for best results. The slightly milder 6 percent variety also works well and is practically equivalent in its baking characteristics to the stronger version. To prepare any baked goods (such as a Charlotte cake), mix the dry baking soda directly into the flour in a deep bowl. Separately, add the table vinegar to the wet ingredients (chicken eggs or water), then combine everything together. The fizzy gas-bubble reaction will occur directly in the dough as the alkaline soda meets the acidic vinegar. For one cup of wheat flour, use no more than a quarter teaspoon of baking soda. To extinguish that quarter teaspoon, you need about one teaspoon of vinegar in the wet ingredients. Note that ordinary table vinegar can sometimes spoil the delicate flavour of sweet pies, cookies, muffins and cakes. Replace it with apple cider vinegar (6 percent) for a fruitier aroma and a noticeably milder flavour in sweet bakes.
How to extinguish soda with citric acid
The most practical and simple way to extinguish baking soda is to add citric acid. You can use either fresh lemon juice or dry citric acid powder from the baking aisle. The proper sequence runs as follows: dissolve one teaspoon of citric acid in a quarter cup of cool drinking water in a small bowl. Separately, dissolve one teaspoon of baking soda in the same quarter cup of water in a different small bowl. Pour both prepared mixtures simultaneously into the bowl with the flour mixture and immediately knead the dough together. Proceed straight to the baking step, since the chemical reaction begins the moment the soda meets the acid and waits for nobody.
How to extinguish soda with kefir or sour cream
Many traditional doughs use kefir as the base liquid, with low-fat sour cream sometimes substituted instead. To extinguish baking soda directly in liquid kefir-based dough, you do not need to mix it with anything special beforehand. Simply add the dry soda directly during the kneading process, since the natural lactic acid in kefir or sour cream activates the soda automatically. For the lightest fluffiest baked goods, add the soda to the kefir base first before incorporating the rest of the flour. This approach distributes the soda more evenly throughout the dough and produces a noticeably better rise during baking. The remaining flour goes in last after the kefir-and-soda mixture is ready.
Recipe demonstration
Many baking recipes online use baking soda for their characteristic rise. Most of these recipes are made from unleavened dough that depends on the soda for proper fluffiness. As a practical demonstration, the simple recipe below for fluffy kefir pancakes shows the kefir-soda extinguishing technique in action and produces beautifully aromatic golden pancakes that taste wonderful for breakfast or weekend brunch.
Fluffy kefir pancakes recipe
These kefir pancakes turn out beautifully aromatic, properly fluffy and golden brown on the outside. Try this recipe at least once, since the pancakes are genuinely very, very easy to make. The ingredients include one egg, one cup of kefir (250 millilitres), one-third teaspoon of vanilla sugar, one tablespoon of granulated sugar, a pinch of salt, one-third teaspoon of baking soda, 230 grams of wheat flour, and sunflower oil for frying. The preparation involves mixing the dry sugars and salt in a saucepan, breaking in the egg, warming the kefir to room temperature (ideally 37 degrees Celsius), pouring it into the egg mixture and whisking until smooth, then adding sifted flour gradually and finally the baking soda last. Let the dough rest for fifteen minutes for the soda to activate and the ingredients to soak. Fry the pancakes in preheated sunflower oil in a thick-bottomed skillet on both sides until golden brown crusts form. Place the finished pancakes on a paper napkin to drain briefly, then serve while still warm. Bon appetit!
Yield: about 12 pancakes.
Preparation time: 35 minutes.
Calories: 215 kcal per 100 grams.
Tips and Tricks
Tip 1. Always test the freshness of your baking soda before using it in any important bake, since stale soda will simply not produce the gas bubbles needed for proper rise. Sprinkle a small pinch onto a plate and add a few drops of vinegar or lemon juice. Active soda fizzes vigorously and visibly within seconds. If you see only weak bubbling or no reaction at all, the soda has lost its activity and should be replaced with a fresh box from the supermarket before continuing.
Tip 2. Choose the right extinguishing method to match the type of dough you are working with. To put the kefir-based extinguishing technique to immediate good use, try our beautifully fluffy cottage cheese cookies roses with meringue, which use baking powder rather than soda but follow similar principles for tender baked goods.
Tip 3. Never use more baking soda than the recipe calls for, since excess soda contributes a noticeably unpleasant metallic soapy taste to the finished bake that absolutely no clever rescue technique can fix afterwards. The general rule for sweet bakes is no more than a quarter teaspoon of soda per cup of flour. Adding too much soda also produces an alkaline yellowish colour in the finished crumb that looks unappealing on the cut surface of the cake.
Tip 4. Knead the dough quickly once the soda meets the acid, since the chemical reaction starts immediately and the gas bubbles will gradually escape if the dough sits unbaked. For another classic homemade dessert that benefits from properly understood baking science, try our richly indulgent Bounty cake with coconut flakes, which uses baking powder for the lightest possible chocolate sponge.
FAQ
What is the difference between baking soda and baking powder?+
Baking soda is pure sodium bicarbonate and needs an acidic ingredient to activate the gas-producing reaction. Baking powder, by contrast, contains both baking soda and a powdered acid (typically cream of tartar) plus a stabilizer, all combined in a single ready-to-use product that activates simply when mixed with any liquid. Baking soda alone produces a stronger lift but requires careful matching with acidic recipe ingredients. Baking powder works in any recipe but produces a slightly less dramatic rise.
Can I substitute baking powder for baking soda?+
Yes, but you need to use about three times as much baking powder as baking soda to get a similar leavening effect. So a recipe calling for one teaspoon of baking soda would need three teaspoons of baking powder instead. The substitution works best in recipes without strong acidic ingredients (no kefir, lemon juice or vinegar in the recipe), since extra acidity in the dough can produce an unpleasantly tangy flavour when combined with the additional baking powder needed.
Why does my baking taste of soda?+
A persistent metallic or soapy taste in finished baking usually means too much soda was used, the soda was not properly extinguished, or the recipe lacked enough acidity to neutralize the soda fully. Always measure the soda carefully (a quarter teaspoon per cup of flour is the maximum for sweet bakes), make sure to mix it with an acidic ingredient if the recipe does not contain one naturally, and never exceed the called-for quantity in the recipe regardless of how tempting it might seem.
How long does an opened box of baking soda last?+
An opened box of baking soda stays active for about six months when stored in a sealed airtight container in a cool dry cupboard. After six months, the soda gradually loses its potency due to slow reactions with airborne moisture and acidic vapours from other ingredients in the cupboard. Always check freshness with the lemon juice test before using older soda in important bakes. For maximum shelf life, transfer the soda to a glass jar with a tight-fitting lid immediately after opening the original box.
