Hello all: I would like to test some software, to find out whether it works correctly. To do this, I want to reproduce a calculation that someone did using a different method. This calculation involves chemistry, and my chemistry skills are not great. I would really appreciate if someone could help me out with what is probably a rookie question! I have data for cation/anion concentrations. But for some reason, although the cations are within a fluid made up of H and O, the H and O data are not given. Given the cation concentrations, is it possible to figure out the corresponding amounts of H and O? If so, how? millimoles/liter Na + = 110.0 Mg2+ = 5.0 Ca2+ = 0.966 Cl- = 121 Thanks a lot for any help!