1. You work in a forensic laboratory and are given an unknown substance, a dirty
ID: 900671 • Letter: 1
Question
1. You work in a forensic laboratory and are given an unknown substance, a dirty yellow powdery solid, and asked to evaluate its purity and to determine whether it might be identical to a given sample of an illegal drug, a pale yellow crystalline solid. Clearly explain what you would do, why you would do it, and how you would interpret your results.
2. You are getting ready to do an experiment and have 0.80 g of
1,4-dichlorobenzene weighed out in a beaker. Someone bumps you from behind and you spill almost all of it on the benchtop. You carefully scoop it up, but of course it gets contaminated with dirt and other residue from the surface of the benchtop. How would you go about removing the impurities and recover most of the 1,4-dichlorobenzene in pure form? Explain the options you might consider and what you might decide to do and why.
Explanation / Answer
1. the testing drug is powder and iligal drug is crystal it is scope to suspect it not that much pure and by tlc camparisition we know its purity MP also helps to know its purity status and if HPLC or LC avalable its ultimate option
2. by disolving the recovery and filteration we can remove inorganic material and other by checking tlc we can know its purity based on column chromatography is the best option
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