Natural Science Forum / Chemistry / Analytical Chemistry / July 2005

I have this PChem problem:
N2(g) + 3H2(g) == 2NH3(g) K = 1.6E-4 @ 400C.  Calculate a) deltaGr0 and b)
calculate deltaGr when the pressures of N2 and H2 are maintained at 10 and
30 bar, resp, and NH3 is removed at a partial pressure of 3 bar. c)....

Can anyone tell what is wrong with our GC with hot wire detector:
- it has not been used for couple of years
- now when running same samples (He-N2-O2) peak height is different
every time

I am looking for a lab that can analyze some old patent medicines. Most
of the specimens are over 100 years old and some samples are just a
scant amount of residue in the bottle. Prefer a facility in Houston,
TX. Reply here or by e-mail.

What is an industrial way of converting fats into oil?
I know how to convert oil into fat but don't know the way of changing
fat into oil

Hallo anyone,
Can anyone tell me how to avoid the problems when measuring calcium
isotope ratios such as 44Ca/40Ca and 40Ca/44Ca ratios...
I am going to do experiments with Ca44 in mussels but then I have to

http://www.chembuddy.com/?left=lectures
Comments on content (and laguage) welcomed.
Questions sections will grow with time.
Best,

Has anyone had an experience in adjusting the pH of sulfate containing
polysaccharides? When I adjust the pH of carrageenan and dextran
sulfate I found that the pH would change over time. For example, 0.5%
kappa carrageenan has a starting pH of 8.3. I adjust its pH to 6.8 with

I have just been working through the FAPAS procedure for doing this,
in Appendix III of the document "FAPAS protocol: organisation and
analysis of data",  on behalf of an analytical chemist colleague (I
myself am not a chemist, I'm a mathematician). I find that most

I'm writting thesis about determination chlorine in oil crude and I'm
looking for  some informations about XRF method, most of all principles
and interferences.
Thanks for help.

I have a couple of HPLC binary data files from an old Merck HPLC system,
controlled by a DOS software: D-6000 HPLC Manager Version 2. The only
output besides ugly needle printer printouts are binary files with the
extension *.rw1 and *.rw2

I am trying to analyze the concentration of iodine in Iodixanol (see
molecule in the following link)
http://dmd.aspetjournals.org/cgi/content/full/27/10/1205/F1
The analysis that I am developing is the determination of this iodine