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free kg solvent


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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

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