How much baking powder should be added to plain flour make it self raising?

Here's why:

* Self-raising flour already contains baking powder and salt.

* Plain flour is just flour with no additives.

* Baking powder is a chemical leavening agent that releases carbon dioxide gas, creating the airy texture in cakes and other baked goods.

Important notes:

* The amount of baking powder you need may vary slightly depending on the recipe.

* Always double-check the recipe's instructions.

* Don't add too much baking powder, as it can make the baked goods taste bitter and rubbery.

* Using fresh baking powder is crucial for proper rising. Check the expiration date on your baking powder.

If you're unsure, it's always best to stick to the recipe's recommendations or use self-raising flour if available.