Ionic Strength Corrections for Stability Constants
Ionic Strength Corrections for Stability Constants
Version 1.5 of the Specific Interaction Theory (SIT) program was released this past September. The program uses specific interaction theory to render ionic strength corrections for stability constants, and includes activity coefficient calculation molar-molal interconversion. The SIT program can be readily applied to industrial processes for which stability constants may be required at very high ionic strengths.
The calculations of stability constants over a wide range of ionic strengths are not trivial, and require for instance a database of ionic coefficients for each ion-ion interaction. The program, developed by L. D. Pettit of Academic Software and part of this IUPAC project, performs the following:
1. calculates activity coefficients (0–5 m)
2. corrects stability constants for the general reaction: xM + yL + zH2O
3. calculates SIT(complex) values from sets of log K/ionic strength values
4. interconverts molarities - molalities
5. interconverts log K(molar) - log K(molal)
The user can select any of 14 background electrolytes and the program uses a text file which currently holds over 360 SIT parameters. The program has an extensive Help file that gives references and equations used. A Russian version, written by Dr. I Sukhno and Dr. V. Buzko, is now available.
Interested persons are invited to download this free program (see Web address below), test it, and send comments.
A comparable program to perform calculations using Pitzer parameters is being prepared. This will perform similar calculations to the SIT program and will also include activity and stability constants changes as a function of salinity, and oxygen, nitrogen, and carbon dioxide solubility as a function of salinity and fluid composition.
For more information, questions, and comments, contact the Task Group Chairman L. D. Pettit <pettit@acadsoft.co.uk>.
www.iupac.org/projects/2000/2000-003-1-500.html
Page last modified 30 October 2003.
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- Contents
- President’s Column
- “It's A Chemical World!”– The Overwhelming Success of A Poster Competition
- IUPAC in Ottawa
- Safety Training Fellows Visit Japan, South Africa, and USA in 2002 and 2003
- A Central Position for Hydrogen in the Periodic Table
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- Pirketta Scharlin Received the 2003 Franzosini Award
- Letters from Readers
- Chemistry's Contributions to Humanity–A Feasibility Study
- The Use of AFM in Direct Surface Force Measurements
- Ionic Strength Corrections for Stability Constants
- Critically Evaluated Propagation Rate Coefficients in Free-Radical Polymerizations: Part III. Methacrylates with Cyclic Ester Groups (IUPAC Technical Report)
- Minimum Requirements for Reporting Analytical Data for Environmental Samples (IUPAC Technical Report)
- Atomic Weights of the Elements 2001 (IUPAC Technical Report)
- Regulatory Limits for Pesticide Residues in Water
- Provisional Recommendations
- On the Claims for the Discovery of Elements 110, 111, 112, 114, 116, and 118 (IUPAC Technical Report)
- Measurement of the Thermodynamic Properties of Single Phases, Vol. VI
- Progress in Polymer Science and Technology
- Solubility Equilibria–in Honor of Heinz Gamsjäger
- Introduction to Modern Inorganic Chemistry
- High Temperature Materials Chemistry
- Plasma Chemistry
- Organo-Metallic Chemistry
- Analytical Chemistry in Africa
- qPCR Technology
- Heterocyclic Chemistry
- Macromolecules
- Polymer Biomaterials
- Photochemistry
- Mark Your Calendar
- Index for 2003
Articles in the same Issue
- From the Editor
- Contents
- President’s Column
- “It's A Chemical World!”– The Overwhelming Success of A Poster Competition
- IUPAC in Ottawa
- Safety Training Fellows Visit Japan, South Africa, and USA in 2002 and 2003
- A Central Position for Hydrogen in the Periodic Table
- Samsung Gives Gift to the IUPAC Macromolecular Division
- Pirketta Scharlin Received the 2003 Franzosini Award
- Letters from Readers
- Chemistry's Contributions to Humanity–A Feasibility Study
- The Use of AFM in Direct Surface Force Measurements
- Ionic Strength Corrections for Stability Constants
- Critically Evaluated Propagation Rate Coefficients in Free-Radical Polymerizations: Part III. Methacrylates with Cyclic Ester Groups (IUPAC Technical Report)
- Minimum Requirements for Reporting Analytical Data for Environmental Samples (IUPAC Technical Report)
- Atomic Weights of the Elements 2001 (IUPAC Technical Report)
- Regulatory Limits for Pesticide Residues in Water
- Provisional Recommendations
- On the Claims for the Discovery of Elements 110, 111, 112, 114, 116, and 118 (IUPAC Technical Report)
- Measurement of the Thermodynamic Properties of Single Phases, Vol. VI
- Progress in Polymer Science and Technology
- Solubility Equilibria–in Honor of Heinz Gamsjäger
- Introduction to Modern Inorganic Chemistry
- High Temperature Materials Chemistry
- Plasma Chemistry
- Organo-Metallic Chemistry
- Analytical Chemistry in Africa
- qPCR Technology
- Heterocyclic Chemistry
- Macromolecules
- Polymer Biomaterials
- Photochemistry
- Mark Your Calendar
- Index for 2003
