REACTIONs are assumed to be charge balanced. The charge on the elements is not used. If you want to add ferrous iron, you should add FeCl2 (or some other anion). The reaction you used is equivalent to native Fe, so the reaction is Fe + 2H2O = Fe+2 + 2OH- + H2 David David Parkhurst (dlpark@xxxxxxxx) U.S. Geological Survey Box 25046, MS 413 Denver Federal Center Denver, CO 80225 Project web page: https://wwwbrr.cr.usgs.gov/projects/GWC_coupled "Michael Zilberbrand" To: "David Parkhurst" <dlpark@xxxxxxxx> <zilberbrand@xxxx cc: gov.il> Subject: Question 06/03/03 11:34 AM Dear David, Could you please help me once more? I have that question. Why do addition of Fe+2 to pure water using REACTION increases the pH. I expected just the opposite following a reaction Fe+2 + H2O = FeOH+ + H+ Help please! Thank you in advance. Sincerely, Michael TITLE Fe+2_test_res.prn SELECTED_OUTPUT -reset false -file Fe+2_test_res.prn -step true -reaction true -pH -pe SOLUTION 1 Temp 25 pH 7.0 REACTION 1 Fe+2 0.5 0.01 moles in 10 steps END -------------------------------------------------- Dr. Michael Zilberbrand Hydrological Service of Israel Research Division P.O.B. 36118, Jerusalem 91360 Israel
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