Is it possible to substitute baking soda for baking powder and if so how?

Even though baking powder and baking soda are different substances, yes, it is possible to substitute each for the other.

Baking soda is sodium bicarbonate, NaHCO3. It's also called sodium hyrdogen carbonate and bicarbonate of soda.

Baking powder is a mixture of baking soda, cream of tartar and cornstarch.

To sustitute baking powder for baking soda, triple the amount of baking powder.

To substitute baking soda for baking powder, divide the amount required by four and then add twice that amount of cream of tartar.

https://www.armandhammer.com/articles/baking-soda-vs-baking-powder