Jump to content
Geochemist's Workbench Support Forum

[OLD] Ion activities


webmaster
 Share

Recommended Posts

From: Hillary A. Thompson

Subject: ion activities

When one produces an activity diagram, e.g. log (Al+++) vs pH, is it correct that the values on the y-axis are in fact activities of the dominant aqueous species and not the bare, unhydrolyzed ion, as is suggested by the axis label? And is the same true for compositional information provided for non-axis species, i.e., one provides the total activity (or concentration?) of all aqueous Mg (e.g.) species if one wishes to include Mg in the calculation? If one is trying to mimic a laboratory experiment in which one knows total ion concentrations, then, one inputs total concentrations (or activities?) for each element, rather than first conducting a calculation (does any part of GWB accomplish this?) to speciate the total ion concentration (and therefore must fix pH in that calculation) and then determining activity of the bare ion from its concentration. Is this correct?

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

×
×
  • Create New...