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.
Description: Binary data
Please note that some U.S. Geological Survey (USGS) information accessed through this page may be preliminary in nature and presented prior to final review and approval by the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the sole responsibility of the user.
Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government.
The URL of this page is:
Last modified: $Date: 2005-09-13 21:04:21 -0600 (Tue, 13 Sep 2005) $
Visitor number 3048 since Jan 22, 1998.