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2010 Ochem Lab Exam 1 - CHEM 3112 Exam 1 M arch 9 2 111...

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CHEM 3112 Exam 1 March 9, 2111 Name TA (circle one) Sachin Qha'ill) Todd Gerard Sam Sathish Lakshmi Charmaine Farai Keep your answers short! For full and partial credit, SHOW ALL OF YOUR WORK! It is expected that the atomic masses for C, H, and 0 are known at this point in the semester. IR and NMR tables are provided on the last page. This page may be detached. Exams will be available on March 22. Please do not ask before then.
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) ---., '}. '10'< Which layer (upper or lower) will each of the following organic solvents usually form when being used to extract and aqueous solution? Solvent Upper Lower arcPt:. ~ lev) Toluene V- Hexane V Chloroform V Dichloromethane V Diethyl ether 0 0 ~ If asked to separate an equal mixture of benzoic acid and 2-naphthol using extraction, explain why an aqueous solution of NaHC0 3 would be far more effective than an aqueous f]/' solution of NaOH. Ik t,.A)OVdo-l be M OR.. eITcc.hvc. becQ.IASC IJ~ Ucu::" wowlc,( ( ..J ,II, be"-'7ofL ~;d I Q«I OhDQS('d +1:> AJ .... OM u.:>/"",c.-l l..A.lou!C).(I Ov\. Y re",,:r I-A) r~. ~ ~ IT ,('cd- uJ,1-l-- ~ol-\., and. YOu wovJcl ~o.-.Jc. ,f.,~ ~~~r sef:J,gJIC,J<. .. Expiainwhy swirling or shaking a solution and its qrying agent hastens the drying process. l-.(.- speeds up "U~ Pl'Oc-63 ~c.Q.l.ASc ""''l!~''''''j \.~it( /n,nc..fc. 11"'1 0 rc:. (O~a.c..f- ,-,HI--. H-c porhcks I/'\uoluee(l ~r~Por-c.. ,.1;' J-t."",-~s c:;.'c. (E);\stanfl.l' ..... i.OVIi''l.j tiL01 '"50 a. be~CI" c.ha.o"c..c.. t-hc..t fl..c. dry,,,,,", ClJ'lt-"'+ WI {' co .... ..:: acrosS rt,o,c, we .... ted""" " (,..) t- c..~.%II""~ 'i- A spinning band column has an HETP of 0.25 in/plate. If the column has 12 theoretical . plates, how long is it? -,,c,A 'X/L' 0 12 (OJ (25."//).),, )( ., ;,:J_ - ~ _ -- lI( /1'(" ./ pl.r, - " . G ~ 3,"] List two irreversible problems that could occur while runnmg column chromatography if --::& you are not paying attention. 1) CdVM" otrY'A.4 ovl-r-. ..J 2} l..lnc~ If'\, S!vtfr y rt.\~IC\ly 11\c.(eC\.~(\5 ?>\"'(\ ~j o~ e.~b"] Solucr-.+- Why is a melting "point" actually a melting "range" and therefore should never be ~ t Y reported as a Single temperature? TJ I~ &. rar'tjL ~("av:5c YOf..,\ ,""sf V t-~t' ~-rMP~''''('lJ(( e-J VJ('wl ft..f Rr~1 Sj~ ~r 1''6w'd ~{l'"lQ.hOr. ern,d v)ct;.J-. tH\-I-; { I-t e. we.ole. C(.V"'p¢vnc4 ,:.s oIV(~ I f f,:'~, jrl/'''J YOVf MO \'l.- C;::f\d Cl rO'J'- (.,.. ~lt,fwc£f1\ ~~e~ h"'<- ~ \\CI\.r- ~(b;.A~~ fYu:>id (-L. r " ft':<'1 pc /t;"J.:A ,e. ~
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The solubility of a compound is 59 g/100 mLin boiling methanol and 30g/100 mL in cold methanol, while its solubility in water is 7.2 g /100 mL at 95°C and 0.22 g/100 mL at 2°C. Which solvent would be better for recrystallization of the compound? Very briefly explain. ;V\<-~c,no\ I Yov... -sI/"lO()..(o( ,\.J~y~ ~ry f.o Sh:.. y ~y ~ wC<..~c.r b~cuo"l'S.( l-t IS k f'~lf ~:"'jS ClUJ oi- ~k-r ,\ \' Jf\ -..,. ."-' .~ r~ ""-"{!.Able I""" -..}Jer I", tr""}£ el""-Ctl"'l>~ e..( n--<. COMpa nO. / ~ wc..y v-_.. ."..., w~ c k 1.-00«-161 """c..~ ! '- c.. rc)'oC~ 6 S.epM':(I""~"'- ~~~(..(' ... ~ eNlcl ,c:, ~ \~s~ c;t>~. ."- Co~d... VJ,,-.\.c.- 41\. h~+- A mixture containing the following three compounds was separated by column chromatography. Predict the order of elution (1 = first).
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