Calc.  SED & PREDOM / SED

A logarithmic diagram shows the concentrations (on a logarithmic scale) for all species in a chemical system. This is usually plotted against a free concentration. Example for the system H+, CO32−:

Log diagram

This diagram was obtained with the following input file:

2 4 0 0
H+, CO3-2
OH-,     -14.0 -1 0
CO2(g),   18.16 2 1
H2CO3(aq),16.68 2 1
HCO3-,    10.33 1 1
lc, -7,-1, H+
lav,-5,-11, t,0.01