Hmm, have you heard of a law known as Henry's Law? It describes that the solubility of a gas in another gas or liquid is inversely proportional to temperature. Essentially, at a lower temperature a gas or liquid becomes more soluble, however, like dissolving a salt, there is a saturation threshold. What can you tell me about limestone? It evolves carbon dioxide upon reaction with an acid, correct? Let's say that all three beverages are at the same temperature and equal amounts of limestone are added to each. What do you think that the bubbling tells us about the initial concentrations of carbon dioxide in the three beverages?