Experiment 5 write-up guidelines

approximate point breakdown by section and brief section descriptions

prelab  10 pts
should include balanced reaction(s), cmpd physical constants, theoretical yield(s), potential hazards, and procedure outline
should also contain observations and data recording during lab

mechanisms of reaction(s)   5 pts

results of experiment   30 pts
turn in product with complete labeling (4) - label should include student name, date, sample name or structure, weight, mp range
report weight (and % yield) of crude and recrystallized product (8) -
product purity (12) - determined by appearance, mp range, and TLC of purified product
TLC plates (6) - turn in 3 TLC plates run in different solvents; plates should be labeled and baseline, solvent front, and spot positions should be marked in pencil.

NMR spectra presentation / interpretation   15 pts
presentation of H-NMR spectra of starting materials (student makes assignment) and representative product benzhydrol sample from student's section
a summary (text form) of each H-NMR spectra (as would be reported in the experimental section of a publication)
assignment of all protons in the molecules to their signals in the spectra
comments about any "extra" signals observed in the spectra and their possible origin

TLC results   10 pts
report of Rf values and identification of components in crude and purified product (based on standard sample and/or best guess)

discussion   5 pts
a breif discussion of how the experiment went, any interesting or notable observations, any particular difficulties encountered, and any special procedures or purification techniques used. compare crude and purified product appearance, mp's and TLC results. disucss which TLC conditions gave the best separation.

conclusion / learning experience   7 pts
in summation, what was accomplished in the experiment and what was learned by the student. make conclusion about final purity of product and the effectiveness of the recrystallization, based on mp and TLC results.

questions   8 pts
experiment 13.1 - questions 1, 3
technique 10 - questions 1, 3

technique grade   10 pts
evaluation by TA and instructor of student's lab technique, use of proper set-ups, cleanliness, attention to safey, general attentiveness to details of lab procedures and rules