I wonder if someone can help me here. For part of my geography dissertation I'm hoping to completely dissolve some very pure limestone (~99% CaCO3) to get some microfossils out. I'll be using either acetic, monochloric or formic acid (probably dilute) because as far as I'm aware these are the only ones that won't dissolve the fossils themselves. Can anyone tell me how to come up with a rough estimate of how much I would need to dissolve say 1kg of CaCO3? I'll be researching & writing detailed methods once my deadlines and exams have passed, but right now I need to come up with a rough figure just to let the lab technicians know what sort of quantities I'll be needing. Sorry if this is more appropriate to homework help mods. Feel free to move it if it is.