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Re: phreeqc-2 v2.7 molarity/molality conversion oddity



Dear Mr. Parkhurst,

Thank you very much for your fast reply. I assume you meant MolaRity is moles/L in your 
first sentence. Then it's completely clear to me. I forgot to take into account that 
molality is moles/kg total solution and not moles/kg solvent (in this case water). 

kind regards,

eric breynaert
 
> Molality is moles/L and the assumed density is 1.0. That implies that the
> input concentrations are equal to moles/kgsolution. To convert this to
> moles./kgw, the sum of the mass of the solutes is subtracted from 1 kg of
> solution to obtain the number of kilograms of water. The moles divided by
> the number of kilograms of water gives molality. If you increase your
> concentrations, you will see more of an affect.
> 
> David
> 
> 
> 
> David Parkhurst (dlpark@xxxxxxxx)
> U.S. Geological Survey
> Box 25046, MS 413
> Denver Federal Center
> Denver, CO 80225
> 
> Project web page: http://wwwbrr.cr.usgs.gov/projects/GWC_coupled
> 
> 
> 
> 



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