I have done in the lab a spectrophotometric study fo the kinetics of the iodination of aniline.
Equal initial concetrations of aniline and iodine were used so when I build the rate graphs of 1/A (absorbance of aniline at 500nm) against time, according to the Beer Lambert Law I get straight lines. But I went through the same procedure twice duirng the experiment that is measured the absorbance of aniline samples periodically and build two graphs which are somewhat the same but still the values have some slight differences between them. Thus the two rate constants that I got from the graph slope have a small difference.
>>>please can you help me to comment on the difference between the two kinetic graphs and constants that is any idea as to where might the causes and sources of error lie.
oh, and another question, the aniline I used was freshly distilled and was told that this was important to obtain good results. Please can anybody explain me why, I mean how would it affect my result if it was not freshly distilled?
Please help me if possible. Thank you