Hello, I've been a little perplexed on a few things involving charge balance in PHREEQC. I am trying to model a simple mixing of 2 solutions, very similar in chemistry, to yield a new pH. The two initial solutions are charge balanced with Cl. The mixed solution is charged balanced (based on the output) by pH (or H+). The charge balance for the original solutions are listed to be very small (10-17), as is the charge balance for the mixed solution (10-12). However, when I manually calculate the charge balance based on the concentrations given in the output for the mixed solution, I get a value of 10-3 to 10-4??? Is this due to rounding of the displayed results? (I've attached an example scenario). I'm currently trying to do a similar calculation in Microsoft Excel - using the charge imbalance of the mixed solution to define my H+ and pH but am not obtaining realistic results. How does PHREEQC use H+ to obtain charge balance? Thanks in advance for your assistance.
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