I don't know if they do it with other beer, but I hear people say it tastes a lot better with the lime.
I have obviously done the work for you, but I'm curious why you just didn't use Google. It would have taken less time than logging onto YA. Lime is calcium oxide, CaO scifun.chem.wisc.edu/CHEMWEEK/Lim... ========== Follow up =========== CaCO3 is limestone, not lime. Lime is made by heating limestone till it decomposes into lime and carbon dioxide.
Pisgachemist is giving you the formula for quicklime (CaO), the others for limestone, marble, chalk etc CaC03.
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