In a message dated 9/28/2001 2:07:43 PM Eastern Daylight Time, squi...@silver.nxlkhost.com writes:
> Roger, > we are already talking about very dilute systems. 10ppm is one part per > 100,000. So ionic impurities take on greater proportionate values.. > Stephen > Stephen: No, the more dilute a solution, the more ideally it behaves. That's why we're in very good shape using solution theory to make these kinds of estimates. Even at concentrations which are significantly greater than dilute (16,000 PPM Ag+, for example), solubility product calculations are still reasonably accurate. In addition, thermodynamic "theory" holds for concentrated solutions. The only difference is that one has to obtain values (usually through experimentation, but sometimes approximated through thermodynamic and other types of modeling) for the activity coefficients in question. Complex systems, however, are another story. Feel free to wring your hands when it comes to solving a system of equations for them. Roger
