Let’s get one thing straight: baking soda and baking powder are not twins separated at birth. They’re more like cousins who look alike but have wildly different personalities. Baking soda is pure sodium bicarbonate—a lone wolf that needs an acid (like buttermilk or lemon juice) to throw a fizzy party. Baking powder? It’s a pre-packaged party pack: it already contains its own acid, usually cream of tartar, so it just needs heat and moisture to get going.
Think of it this way: baking soda is a shy singer who needs a duet partner to perform. Baking powder is a full karaoke machine—push a button, and it starts belting out tunes on its own. Swap one for the other, and you might end up with a dessert that tastes like a science experiment gone wrong.