For most baking recipes, the general rule is to use 1 teaspoon of baking soda for every cup of all-purpose flour. However, this can vary depending on the desired result and the type of recipe. For example, if you're making a cake that requires a light and airy texture, you may use slightly less baking soda, while if you're making a cookie recipe that requires a chewier texture, you may use slightly more baking soda. It's always a good idea to refer to the specific recipe you're following for the exact amount of baking soda to use.