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 > > > >
Please note that some U.S. Geological Survey (USGS) information accessed through this page may be preliminary in nature and presented prior to final review and approval by the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the sole responsibility of the user.
Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government.
The URL of this page is:
Last modified: $Date: 2005-09-13 21:04:21 -0600 (Tue, 13 Sep 2005) $
Visitor number 3089 since Jan 22, 1998.