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  1. Hi: Perhaps this is a very simple question but if run a reaction path simulation with the flush option using only simple tracers..why does it take more than one reacted fluid volume for the composition to change from solution A to solution B ? For example in this file minerals, sorption, and redox are all suppressed and i am basically displacing a fluid with pH 5.4 by one with pH 3.334. Why does it take more than 1 kg reacted H2O mass for the pH to reach 3.334 ? (it takes almost 4 kg). Any ideas ? temperature = 20.4 decouple ALL H2O = 1 free kg pH = 5.4 Na+ = 1 umolal Cl- = 1 umolal balance on Cl- reactants times 10 react 1 kg of H2O react .000463 mol of H+ react 2.16e-11 mol of OH- react 1 umol of Na+ react 1 umol of Cl- suppress ALL flush plot = character delxi = 1 linear epsilon = 5e-11
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