The azeotrope for HCl is at about 6N; for HNO3 it is about 15N.
You cannot go to higher conc than these by evaporation.  Can't
tell you about the 'topes.
Cheers,
Ted

At 12:16 PM 11/14/97 MET, you wrote:
>Dear all,
>
>If I evaporate a 10 ml 6N HCl at temperature of 60oC down to a small drop
>of about 0.2 ml. Is this drop still 6N HCl or it changes (>>6N or <<6N).
>Any hydrogen isotope fractionation between this small drop and the original
>acid?
>
>How about with a 6N HNO3?
>
>Many thanks for your comments.
>
>Shao-Yong
>*****************************************
>Dr. Shao-Yong Jiang
>Max-Planck-Institut fuer Chemie
>Abt. Geochemie
>Postfach 3060
>D-55020 Mainz
>Germany
>fax: 49 - 6131 - 371051
>phone: 49 - 6131 - 305261
>email: [log in to unmask]
>*****************************************

___________________________________________________________________
Ted J. Huston           [log in to unmask]       Office:  313-647-1836
Dept. Of Geological Sciences                     Lab:  313-AREA-51x
University of Michigan                           Fax:  313-763-4690
425 E. University, CCLittle Rm 2534
Ann Arbor, MI 48109-1063

Specializing in thinking like a trace element
___________________________________________________________________