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 (although it can be for certain substances).

               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
               curves I used for the fits.

        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 25. 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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