About baking soda and baking powder. Baking soda, bicarbonate of soda, and baking powder give off carbon dioxide gas, which fizzes, creates bibbles, and helps baking mixtures rise and get lighter. Baking powder is made of a combination of ingredients and it can be used in more recipes than baking soda. Both baking soda and baking powder should be added to the liquid in the recipe quickly and at the last minute and popped right into the oven or onto the griddle.