Thursday
July 31, 2014

Homework Help: science(chem)

Posted by ~christina~ on Friday, March 28, 2008 at 5:30pm.

What would cause the peaks in a IR analysis to be smaller than they should be? My sample had the right peaks where they should be and they were the right shape but were shorter then they should be.

Something different is what the y axis says on the IR analysis that they gave us so we would know how the IR was supposed to look for our samples. But the y axis on the one they gave us said "percent transmittance" while the IR graph had "percent reflectance". Not sure if it's the same.

If they are though then an example of the difference in peak size is:

my sample of 4-bromo-2-chloroacetaniilide
1 middle sized peak: 3275.24 cm-1
and the intensity was : 69.608 % reflectance

The given IR card showed the peak going all the way down to about 30% percent transmitance ( I don't have the exact value)

Thank you.

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