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Re: Question




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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