Organic Chemistry Lab 3_recrystallization_10.15.13
Transcript of Organic Chemistry Lab 3_recrystallization_10.15.13
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@WOLNEI IACDEY[WU E
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77=B-[uc
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Entr`kuite`n:
Wcirystlbbezlte`n `h l i`dp`unk es l vcry chhcitevc dcta`k gy waeia `nc iln purehy ln `rolnei
i`dp`unk lnk strep lwly lny edpuretecs. Irystlbbezlte`n rchcrs t` tac 9-kedcnse`nlb
struiturc/lrrlnocdcnt h d`bciubcs acbk t`octacr gy B`nk`n kespcrse`n h`rics. [aes lrrlnocdcnt es
ekclb h`r purp`scs `h pureheilte`n gcilusc et lbb`ws h`r tac i`dp`unk `h entcrcst t` gc kess`bvck `r
dcbtck lt aeoa tcdpcrlturcs, rcbclseno tac edpuretecs talt wcrc prcve`usby trlppck wetaen ets s`bek
stltc lnk prcvcnteno tac i`dp`unk hr`d hubby h`rdeno l irystlbbenc struiturc. Sp`n rcbclsc `h tacsc
edpuretecs ent` tac s`bvcnt (wacn kess`bvck en s`bvcnt `r en d`btcn stltc), tac i`dp`unk `h entcrcst es
lbb`wck t` i``b lt l sb`w rltc, lnk webb h`rd l irystlbbenc struiturc, `nic hrcc `h tac edpuretecs talt
alvc gccn tlfcn up gy tac s`bvcnt.
Ycbcite`n `h ln lppr`preltc s`bvcnt es vetlb t` tac pr`icss `h pureheilte`n tar`uoa rcirystlbbezlte`n. Ln
ekclb s`bvcnt dust alvc l g`ebeno p`ent talt es bcss taln tac dcbteno p`ent `h tac i`dp`unk, tac s`bvcnt
sa`ubk n`t gc rclitevc weta tac i`dp`unk `tacrwesc tac kcserck i`dp`unk i`ubk gc b`st. [ac s`bvcnt
sa`ubk gc v`bltebc cn`uoa t` gc clseby rcd`vck hr`d tac s`bute`n lhtcr tac i`dp`unk als i`dpbctck
rcirystlbbezlte`n. [ac lppr`preltc s`bvcnt webb lbs` cetacr i`dpbctcby kess`bvc lbb `h tac edpuretecs, `r
tac edpuretecs cntercby ens`bugbc en tac s`bvcnt. Cetacr `h tacsc webb lbb`w h`r tacer chheiecnt rcd`vlb
hr`d tac purc i`dp`unk. En taes plrteiublr ilsc lnk en i`nsekcrlte`n `h tac cxpcredcntlb kcseon wc
s`uoat l s`bvcnt talt w`ubk i`dpbctcby kess`bvc tac edpuretecs s` g`ta tacy lnk tac s`bvcnt i`ubk gc
hebtrltck lnk pubbck lwly hr`d tac kcserck i`dp`unk. [ac i`dp`unk `h entcrcst sa`ubk n`t gc
kess`bvck en tac s`bvcnt lt r``d tcdpcrlturc yct cetacr kess`bvc `r dcbt en tac s`bvcnt lt aeoa
tcdpcrlturcs. [aes lbb`ws us t` fccp edpuretecs kess`bvck en tac s`bvcnt up`n i``beno waebc tac kcserck
i`dp`unk h`rds l s`bek, irystlbbenc struiturc. En tac cvcnt talt l suetlgbc senobc s`bvcnt ilnn`t gc
h`unk h`r l plrteiublr i`dp`unk, et es tacn lppr`preltc t` ia``sc l s`bvcnt pler.
Y`bvcnt plers sa`ubk gc ia`scn ilrchubby s` talt tac herst, predlry s`bvcnt kess`bvcs tac i`dp`unk
i`dpbctcby. [ac sci`nk s`bvcnt sa`ubk n`t kess`bvc tac i`dp`unk, yct g`ta s`bvcnts dust gc desiegbc
weta clia `tacr (_ebbelds`n, 7=
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s`bugebety `h tac kcserck i`dp`unk just sbeoatby cn`uoa t` lbb`w h`r l slturltck s`bute`n lnk h`r
rcirystlbbezlte`n t` iiur up`n i``beno.
[aes blg`rlt`ry rcquerck s`bugebety tcsteno, t` ia``sc ln lppr`preltc s`bvcnt talt dct tac lg`vc
iretcrel, lnk scrvck t` dckeltc tac pureheilte`n h ln unfn`wn rolnei i`dp`unk vel rcirystlbbezlte`n.
Y`bugebety tcsts h`r tac unfn`wn rolnei i`dp`unk wcrc i`nkuitck weta tac s`bvcnts _ltcr Ctaln`b
lnk Beor`en. Lhtcr ia``seno tac lppr`preltc s`bvcnt rcirystlbbezlte`n pr`icss wls ilrreck ut useno l
senobc s`bvcnt systcd. Lt l bltcr kltc, l s`bvcnt pler wls usck, i`dp`sck `h _ltcr lnk Dctaln`b, t`
purehy tac sldc `rolnei i`dp`unk tar`uoa rcirystlbbezlte`n. I`nherdlte`n h tac unfn`wn i`dp`unk
wls liaecvck gy kctcrdenlte`n h l dcbteno p`ent rlnoc lnk i`dplreno cxpcredcntlb vlbucs t` fn`wn
dcbteno p`ents `h `rolnei i`dp`unks ([lgbc 9.7, _ebbelds`n, 7==
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Gcnz`ei liek
I8A3I@@A
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l bequek/`eb stltc `h tac i`dp`unk talt es gcoenneno t` scplrltc hr`d tac s`bute`n. [aes lkkete`n `h
kr`ps `h tac sci`nk s`bvcnt es ncicsslry t` cnsurc l slturltck s`bute`n ncicsslry t` greno tac s`bute`n
lnk tac i`ntleneno i`dp`unk t` tac grenf `h rcirystlbbezlte`n just gch`rc rcd`veno tac s`bute`n hr`d
tac aclt s`uric lnk lbb`weno et t` i``b lt r``d tcdpcrlturc.
[ac rcdlenkcr `h tac pureheilte`n pr`icss wls ilrreck `ut ls kcsiregck en Cxpcredcnt
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[aes kcorcc `h rci`vcry sccdck t` gc l rcls`nlgbc ld`unt, kcd`nstrlteno tac chheiecniy `h
tac dcta`ks. [ac dcbteno p`ent kctcrdenlte`n sa`wck l rlnoc `h
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Wcs`urics
Dlir`silbc lnk Deir`silbc @rolnei Cxpcredcnts, _ebbelds`n, F.B., 7nk
Ckete`n. K.I. Aclbta lnk
I`dplny