Good day David, I'm trying to use PHREEQCi to model the effect of adding lye to a sedimentation pond. My approach is to specify the pond as "Solution 1" and the lye as "Solution 2" and then use the "Mix" command to mix these solutions in various ratios to see the resulting pH change and precipitates. The lye consists of a 50 wt% NaOH solution (19.125 molar, pH = 15.6). Since lye / NaOH is not listed in the "Individual element input" window of the "Solution" menu I attempted to add it using the "Solution Species" and "Solution Master Species" menus. However, I end up with convergence errors for lye and the activity of water, not to mention a terrible charge imbalance for Solution 2. I've attached my input file. If you have time, could you please take a look and let me know what I'm doing wrong and suggest some ways to overcome my problems? Thanks! Shane Matolyak Maxim Technologies, Inc. Bozeman, MT(406) 582-8780
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