Exp 15 help, graphs, etc.

[robert zellmer]

I guess some of you have started your reports for exp 15 since
I've received questions about it.

I have a help file.  You will find it by going to the following link,

*Helpful Tidbits for 1220* 
<http://www.chemistry.ohio-state.edu/%7Erzellmer/chem1220/faq/faq_1220.htm>

and then clicking on the link for exp 15,

*Exp 15 - Help for Exp 15* 
<http://chemistry.osu.edu/%7Erzellmer/chem1220/faq/exp15.txt>

I also have an example of the data tables and graphs for exp 15,

*Exp 15 - Example of Data Tables and Graphs Using MS Excel* 
<http://chemistry.osu.edu/%7Erzellmer/chem1220/lab/exp15.pdf>

These are simply examples.  It doesn't show how to do them.  Please
note a couple of things:

     1) Parts A and B are both in H2O as solvent and are graphed as
*ONE *set of data.  Make them one set of data in Excel.  There
         should be a smooth curve fit.  It shouldn't be a straight line in
         this case (or that for the mixed solvent).

         Part C is a separate set of data and should be a separate 
line.  Again,
         use a non-linear best-fit line.

     2) Do *NOT *draw the lines by hand.  There is NO need to.  If you have
         decent data *Excel *should be able to do a pretty good job at 
putting
         a smooth curve "through" your points.  You should NOT have a wavy
         line.  You should use a "scatter" graph with no lines and then 
fit the
         points with a trend line.  Use a non-linear best-fit line. Look 
at the
         curve I used for the fit.

     3) If you have a point which seems to be out of place you should 
include
         it on the graph but not the trend line fit.  You do this by 
plotting all the
         "good" points as one set of data and the "bad" point as a 
separate data
         set.  Then you can have Excel draw the trend line for the 
"good" points.

     4) Note what is plotted on the x and y axes on graph 2 and the 
direction
         of curvature for the 2nd graph in my example.  You should have that
         same curvature.  If you don't (it looks more like graph 1) 
you've likely
         graphed mole fraction on the y-axis vs. temp. on the x-axis 
(reversed
         from what you should have).

Also, someone asked about the "Points to Consider" on page 23. These
are there to help you with some of the things you should discuss in the
Results/Discussion section.  I've also got some things in the "Exp 15 
Help File"
about this section.

Dr. Zellmer
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