This data is very interesting. Thank you for doing this research.

I downloaded the Excel spreadsheet and began playing with it. Only problem is when I click on the "Calculate pH/TA" button, I get an error message "Compile Error - Can't find project or library". When I click OK, it takes me to the debugger. It highlights "SolverReset" in the "Sub Calculate_pH_TA_FC_CYA()" section of Module1. Any idea what the problem is on my end?

Thanks,
Jim