Hello,
I’ve a question about the act2. I use the database of thermo.com.v8r6+. I tried to make an EH-pH diagram of copper (log a = -3) and sulfate (log a = -3) and this worked well.
But I am worried about the circumstance that
1)Cu++ is the “Diagram species” and SO4-- is “In the presence of” it makes a different EH-pH diagram, compared to the diagram if these two species are swapped to
2)SO4—is the “Diagram species” and Cu++ is “In the presence of”.
My question is why are these two diagrams are different from each other and why have the second diagram less phases then the first diagram.
For me it was also unclear from the manual what does it mean if a species is “Diagram species” and what does it mean if a species is “In the presence of”. I thought that in the two cases shown above both diagrams should be the same.
Furthermore, if the species Cu2+ in field of “In the presence of” are “speciate over x-y” in the second case it makes another diagram.
See attached the jpg’s of the input file and the out put file.
Greets
Arne
