If you work in a lab as I do, you should try out the Chemical Calculator
program which I wrote.
Chemical Calculator (tm) is a shareware program designed for chemists,
biologists and other scientific professionals. Its main purpose is to
perform the calculations involved in the calculation of the amount of
reagent to use when mixing up solutions. Chemical Calculator is a shareware
program. You can use a fully functional version for 90 days and if you like
it you can register it for $30.00. If you don't register Chemical
Calculator you can still use a slightly disabled version for free after the
90 day trial period. Requires Windows 3.1 or later. More information is
available on the Chemical Calculator Web Site: "http://www.erols.com/cbaba".
The program can also be downloaded from there.