Sorry about the typo, yes my first sentence should be "molarity".
> molality is moles/kg total solution and not moles/kg solvent (in this
case water)
However, "molality" is moles per kilogram water; "formality" is moles per
kilogram of solution. Whatever, I am sure that PHREEQC makes the
conversions correctly.
David
David Parkhurst (dlpark@xxxxxxxx)
U.S. Geological Survey
Box 25046, MS 413
Denver Federal Center
Denver, CO 80225
Project web page: https://wwwbrr.cr.usgs.gov/projects/GWC_coupled
Eric Breynaert
<Eric.Breynaert@xxxxxxxx To: David L Parkhurst <dlpark@xxxxxxxx>
uven.ac.be> cc:
Subject: Re: phreeqc-2 v2.7 molarity/molality conversion
11/06/2003 01:34 AM 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: https://wwwbrr.cr.usgs.gov/projects/GWC_coupled
>
>
>
>
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