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