Registering as user
Before you download, it is recommended that you register below
as CHEAQS user, because then you will be informed about updates
and bugs. You can expect two to four emails per year. Of course
your email will not be used for anything else.
The current stable version is CHEAQS Next. In addition to that, a (so far incomplete) new version is available, especially designed for 64-bits operating systems. More information below the table. You can download CHEAQS Next by clicking in the table below. Stay tuned (e.g. on Facebook or by registering below).
Next (2015 till now) (click here to download): version
Next (64-bits only; incomplete version) (click here to download): version
|Size of setup
||Windows XP and higher
(incl. Windows 10)
||Windows 7 and higher but
only if 64-bits
here to download
||Click here to download version 0.1.0.18 (also valid for 0.1.0.19)|
||Click here to download||Click
here to download version 0.1.0.19
See the table below for a comparison of the versions.
|Database manipulation routines||Yes||Not yet (viewing included since 0.1.0.15)|
|Mean Spherical Approximation model||No||Yes|
|Built-in charge balance correction||No||Yes|
|Built-in support for different languages||No||Yes|
|Fully functional print preview||No||Yes|
|Revised start menu look and feel
|Improved calculation speed||No||Yes|
|View output sets side by side||No||Yes|
|Downloading and viewing the manual and database document from within the program||No||Yes|
I recommend not to download CHEAQS from other sites. Only downloading CHEAQS from here guarantees a secure and up-to-date download. Also, I recommend not to use any other uninstallers than the one included with CHEAQS Next. Their 'solution' is usually worse than the supposed problem.
Regarding the new 64-bits version: already some time ago I decided I wanted to make a new version of CHEAQS, especially designed for 64-bits systems. The new version includes the MSA-model (Mean Spherical Approximation model). This model is able to predict ion activities at high salt concentrations. Unlike many other available models (which are at best semi-empirical), the MSA-model has a solid theoretical basis. Of course there is always a ‘but’. The ‘but’ here is that at this moment the required derivations are available only for a limited number of ions, but I expect that this number will increase soon. I prefer to invest in a method with a solid theoretical basis than in a method that will never become more than semi-empirical. I am grateful to Prof. Jean-Pierre Simonin (CNRS, Paris, France) who developed this model and helped me with the implementation in CHEAQS. Together we prepared a paper that was recently accepted.
It will take some time before this new version is complete but I made considerable progress as you can see from the table above.
- Simonin , J.-P. (2017). Thermodynamic Consistency in the Modeling of Speciation in Self Complexing Electrolytes. Ind. Eng. Chem. Res. 2017, 56, 9721−9733.
- Simonin , J.-P. (2018). Determination of Thermodynamic Complexity Constants and Speciation for Multicomplexing Electrolytes within the Mean Spherical Approximation Model. Ind. Eng. Chem. Res. 2018, 58, 448−460.
- Verweij, W. & J.-P. Simonin (2020). Implementing the Mean Spherical Approximation model in the speciation code CHEAQS Next at high salt concentrations (Journal of Solution Chemistry 49, 1319–1327; click here for link (opens in new window) )