The following reference has a table with the number of water and urea molecules for a given molarity, at a given temperature:
Stumpe and Grubmuller, J. Phys. Chem. B. 2007, 111, 6220-6228. Roughly, a 4.5:1 ratio of water:urea molecules will give you 8M urea. This varies somewhat with temperature because of box size differences. Regards, Matt --- Matt Wyczalkowski Doctoral Candidate, Biomedical Engineering Pappu Lab: http://lima.wustl.edu Washington University in St. Louis On Thu, Sep 4, 2008 at 1:51 PM, <[EMAIL PROTECTED]> wrote: > Hi All, > This is a trivial question. But I am quite puzzled about it, and I really > need someone's kind help. > > I want to prepare 8M urea solution box, for which I might need to know input > as number of water molecules and of urea. Now my query is how to make sure > of these exact number of molecules. I know its really a basic question. One > thing could be by experiment if we can make sure exact number of moles of > water added to make molar solution. But i dont have any access to such wet > lab things. So if anyone can help me out how to do these back end > calculations. > Another query is will the box size also play a role? > > Please be patient with this trivial query, but this simple calculation > question is baffling me from quite a few days. > > Thanks in advance, > Regards, > Monika > > > _______________________________________________ > gmx-users mailing list [email protected] > http://www.gromacs.org/mailman/listinfo/gmx-users > Please search the archive at http://www.gromacs.org/search before posting! > Please don't post (un)subscribe requests to the list. Use the www interface > or send it to [EMAIL PROTECTED] > Can't post? Read http://www.gromacs.org/mailing_lists/users.php > _______________________________________________ gmx-users mailing list [email protected] http://www.gromacs.org/mailman/listinfo/gmx-users Please search the archive at http://www.gromacs.org/search before posting! Please don't post (un)subscribe requests to the list. Use the www interface or send it to [EMAIL PROTECTED] Can't post? Read http://www.gromacs.org/mailing_lists/users.php
