Lec 9 | MIT 5.301 Chemistry Laboratory Techniques, IAP 2004

[zinazina11]

omg that part with the romantic music and "you may want to watch...they can be very beautiful" cracked me up xD wow i hope i get good crystals like that tomorrow...

[haubsen]

why do u heat every shit up? so unnecessary. most stuff decomposes on heating, esp with impuritys inside the sample. just add fucking hexane and dcm, evaporate the dmc, so the solution gets less polar, when its cloudy enuff u freeze the shit and bam here u go, massive crystals. wash it with hexane and u win. works almost every time.

[pcxxy]

very detailed, thanks. 5/5

[fugert]

Has anyone really been far even as decided to use even go want to do look more like?

[spunisphun]

@fugert whhhhatt the fuck are you trying to say here?

[16mcsf]

hate the freaking music!

[vaibhav1803]

inexperienced lecturer spoils the fun..!!

[bepiozo]

Totally irrelevant... but was that piano piece in the beginning Debussy?

[reclusivesage]

Yeah, Arabesque 1.

[0Sebek0]

funny

[PreDraKhan]

If You Could Down Load Them Into Your Blinking Memory We Might Actually Learn...

[srflamenco]

won't seeding create an impurity in the solution, and therefore create impure crystals? I thought the point to recrystalization was to extract PURE crystals

[satanismybrother]

basically no. while your seed crystal might be slightly impure - the bulk of the material wont contain the impurity. When compounds crystallize it is a sign of high purity

[RatkoUSA]

Somewhat true, but inaccurate, if the process is performed incorrectly, or the original crystals formed in less than ideal conditiona, a number of things can occur, for instance impurities can become encapsulated within the crystals.

The technique demonstrated in the video is REcrystallization, obviously had the original crystals been "high purity" purification through recrystallization would serve no purpose.

Perhaps crystallization is a sign of at least relatively fair purity.

[jiaxi1]

@satanismybrother i made this video!

[joshdkatz]

you seed it with pure product...

[srflamenco]

@joshdkatz o ok thanks

[teddyterrorist]

thank youuuuu :D

[zhouyibing]

Good