Do you remember as a child mixing baking soda and vinegar to make a volcano? The gas produced was carbon dioxide. Alkaline chemicals, such as baking soda, in contact with an acid, produce bubbles of carbon dioxide. In making pancakes containing lemon juice, buttermilk, or another acid compound, soda is used to make them airy, fluffy... Because soda begins to react as soon as it meets an acidic liquid, it is important to mix the soda with the dry ingredients, and cook the batter as soon as the liquid is added. Is there is not enough acidity in the batter, or too much baking soda is added to the batter,
the baking soda will leave a soapy taste.