ALL BAKING SODA DOES NOT HAVE ALUMINUM!!!
Baking soda isn't just an ingredient in your cookie recipe — it can also help remove stains from your teeth and even ease a sore throat.
Baking soda is alkaline, which means it has a higher pH value than acids like lemon juice, buttermilk, vinegar, sour cream and other common baking ingredients. So when it interacts with an acid, which has a lower pH value, it creates a chemical reaction, releasing carbon dioxide, as it tries to get to a neutral pH value.
When to use baking soda and when to use baking powderRecipes that already have acidic ingredients are designed to react with baking soda. “If you use powder [in these recipes], you’ll have left over acidity,” said Souza. Whereas, if you use baking soda when a recipe calls for baking powder, you likely won’t have enough acid to make it work, he said.“A good rule of thumb is to look at your recipe, and if you’ve got acidic ingredients, you could be pretty safe going with baking soda,” he said. “If it doesn’t have a natural source of acid, and you want to use a chemical leavener, baking powder is going to be a better bet.”
While baking soda is more stable than baking powder, which already has the acids ready to activate with heat or moisture, it’s a good idea to keep both in closed containers and, like other pantry staples, toss them after six months to a year, because they will lose some of their strength and won't taste the same.