A balanced chemical leavening such sodium bicarbonate, along with an acidifier is another common ingredient. When reacted together, the acidifier has the ability to release all of the carbon dioxide from the sodium bicarbonate. A variety of acidifiers can be used, including potassium bitartrate, tartaric acid, and disodium phosphate. The type of acidifier used depends on when the preferred release of CO2 is. If the release would be most beneficial when the batter is forming, citric acid would be ideal because it is fast acting. The amount of acidifier depends on which agent, such as sodium bicarbonate, is used because they have varying neutralization points.