1. Problem 4.2, Benjamin (2002). Do parts (d) and (e) only. You are encouraged to create the log C-pH diagram using the triprotic acid spreadsheet on the Extra Materials page. For part (e), write out the recipe, reactions, species, mass action laws, mass balances, charge balance, and proton condition for each part. Determine the solution pH graphically using either the charge balance or the proton condition. Show lines for the left-hand side (LHS) and right-hand side (RHS) of the equation used to solve the problem.
2. Problem 4.7, Benjamin (2002). For part (d), write out the recipe, reactions, species, mass action laws, mass balances, charge balance, and proton condition. Determine the solution pH graphically using either the charge balance or the proton condition on a log C-pH diagram (you can copy the one in the book or recreate one using the diprotic acid spreadsheet. Show lines for the LHS and RHS of the equation used to solve the problem.
3. Pace et al. (2007; "Transport of Sr2+ and SrEDTA2- in partially-saturated and heterogeneous sediments", Journal of Contaminant Hydrology 91, 267-287) examined the effect of ethylenediaminetetraaceticacid (EDTA) on the transport of strontium through sediments collected from below radioactive waste storage tanks at the Department of Energy's Hanford Reservation in Washington, DC. In their experiments, they added EDTA as Na2H2EDTA at a maximum concentration of 0.228 mM. For this EDTA concentration, create a log C-pH diagram showing the speciation of EDTA species and determine the concentration of EDTA4- at the experimental pH.
Last updated on September 18, 2007 at 10:55 PM by Joe Ryan