Hi Jia,
Thank you so much for your former response. I've revisited the project and had a few additional questions if you or anyone else could assist. I unfortunately do not have a file for the above image, however we are not even sure if it is accurate for the situation we're attempting to model, so I'm basically starting from scratch.
The scenario is wanting to titrate in 0.18 M of NaSO4 into a solution of 5 mM Cu(2+) and 1 mM NaNO3 at pH5 to determine the concentration of free copper and copper complexes. I'm going to include screenshots of what my React setup is. I've looked through the manuals but am still struggling with error messages. I was first receiving an error regarding sulfate needing to be in the basis, however it is not in my initial solution so I set this as 0. I am also confused on what my charge balance ion would be.
Thanks so much for any help on this issue!
Emma