Having chemical formula Na2HPO4, Citric Acid an important ingredient in making bath fizzies & bath bombs. It is sometimes used to reduce the pH level of your daily soap. It is produced from the fermentation of cane sugar and used to help prolong a products life and in maintaining a products texture. Moreover, Citric acid is used widely in the beverage, cosmetic, food, and pharmaceutical industries. It is best to store this acid in a cold and dry environment and prevent moisture getting to it.