Spana  SPANA / Modify Chem. System

Example of a logarithmic diagram showing the concentrations (on a logarithmic scale) for all species in the system H+, CO2(g). Note that the component CO32− in DATABASE has been exchanged for a reaction, in this case for CO2(g).

Diagr H+ / CO2

Note that the concentration of CO2(g) is not shown. The calculations consider the aqueous phase only, and the concentrations for gases are set to zero. The fugacity (≈ partial pressure) is calculated and it is displayed in log activity diagrams.

The diagram displayed above was obtained with the following input file:

2 4 0 0
H+, CO2(g)
OH-,   -14.0   -1 0
H2CO3,  -1.468  0 1
HCO3-,  -7.82  -1 1
CO3 2-,-18.149 -2 1
LC, -9 0 H+
LAV, -3 -9.7  LA, -3.5