For a bread/cake already baked, dip it in vinegar.
I dont think you can
Baking soda will cause things to rise also. Muffins are smaller so there is not as much need for lift. Baking powder will give more rise than soda. Whoever created the recipe chose to use soda instead of baking powder.
Helps Rise
The recipe that I use calls for baking soda.
To replace for example 3 teaspoons of baking powder with baking soda, mix 1 teaspoon of baking soda with 2 teaspoons of cream of tartar.
It depends on what the recipe is
Baking powder is a mixture of baking soda, starch and an acid (often tartar) to activate the baking soda. Since baking soda is already in the baking powder, it is possible you will not need any additional baking soda. Baking powder and baking soda are used to "raise" or puff up the pastry - too little and it will not raise properly...too much and it will taste like soda. If you do not have a specific recipe, you will need to experiment.
yesMore information:Although the purpose of adding baking soda to cookie dough is to help the cookies rise, adding baking soda to a recipe that does not call for it could have the opposite affect. Too much baking soda, or adding baking soda in addition to baking powder, might also ruin the taste of the cookies.
No, baking soda cannot substitute for baking soda because they are the same thing. Baking soda is just another name for sodium bicarbonate.
yes indeed
whether or not your cakes or biscuits rise correctly. Baking Powder is baking soda along with the addition of an acid, such as alum or cream of tartar (tartaric acid) which aids in the breakdown of the soda to make the recipe "rise" better. Using soda without an added acid, the recipe will not rise as much; often when just soda is used the recipe will call for the addition of lemon juice or vinegar to aid in rising.
if you think it is baking soda you are correct
Baking soda and baking powder are very different in how they work. Think of baking powder as making something more light and fluffy. Baking soda is going to make something taste less sweet and slightly more light. But yes. If your recipe calls for baking soda, or baking powder using the correct amount of both is important. You cannot substitute one for the other.