tam Posted January 30, 2012 Share Posted January 30, 2012 What's the difference between "free kg" and "kg" of H2O (in the basis pane of REACT)? Thanks! Quote Link to comment Share on other sites More sharing options...
Brian Farrell Posted January 31, 2012 Share Posted January 31, 2012 Hi Tam, A free kg H20 refers to 1 kg of solvent water, plus more water required to form secondary species. If you use the bulk constraint for water, 1 kg is split between the free water molecules in the solvent and the water which forms the secondary species. People typically use solvent water as a free constraint. See Chapter 3 in the Geochemical and Biogeochemical Reaction Modeling text, or Section 7.2 of the GWB Essentials Modeling Guide for more of a discussion on free vs. bulk constraints. Hope this helps, Brian Farrell Aqueous Solutions LLC Quote Link to comment Share on other sites More sharing options...
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