Never crystallised acetanilide , but it must be almost completely insoluble in cold water some things are very finicky just a few drops too much and you’re waiting forever and nothing will precipitate out . Very nice job if only all things were this straight forward
Yeah, I liked how you measured the whole thing to then deduct the weight of the purple, but my instructor asked us to go back and do it the old fashion way saying that paper will absorb the impurity making the weight higher and a high fake yield, so people check with your instructor before you copy this technique or be smart about it lol.
Yes, always follow what your instructor is telling you. Your instructor is also correct. This is corrected for by doing an acetone rinse and leave it on the vacuum for about 10 minutes. However, since the main focus in this lab is the spectra parts, it's not a big deal.
It works fine without solvents, eugenol is denser than water, so it phase separates below the water. you can directly remove it with a pipette. The yield suffers, though, you lose a lot, stuck as tiny suspended droplets, hence why organic solvent extraction is more efficient.
I absolutely love these qualitative analysis videos. I have Vogel's textbook but it's a bit out of date. Is there any chance of getting the accompanying lecture notes (if I give you my e-mail)? Otherwise can you recommend another source of information that contains the whole flow chart sequences for a complete analysis?
For this lab, we also needed the measure of the weighing paper by itself. Also the last readings on the screen I am unable to read and you ended the video without saying what it was.
