GPC Unknown Analysis

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GPC Unknown Analysis

The following instructions vary a little bit according to the experimental details of our

GPC experiment (each year, it’s a little different).

Analysis of the unknown polymers. a) Make a

c

vs.

M

plot to show the whole distribution for the unknown (or multiple unknowns, if you wish) using the datasets provided by the TA. You can do this manually for all I care, and I actually recommend converting a few of the DRI vs

V e

points to

c

vs

M

points that way to ensure you know how to proceed. You may wish to check with the appropriate HowTo guide ( http://macro.lsu.edu/howto ).

Then you should use Excel, a QuickBasic program, Origin or something to calculate for each GPC slice. (Hint: you don't know the concentration,

c

, only things proportional to it, like the DRI signal). b) Report

M w

, M z

, M n

, M z+1

and devise a way to estimate uncertainties for

M

w

and

M

n

.

State

how

you base your ± estimates.

Grading criteria: c vs M plot /5

Mn,Mw,Mz,Mz+1 /10

+/- in a rational way /5

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