2010 Ochem Lab Exam 1

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 semester. IR and NMR tables are provided on 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 solution of NaHC0 3 would be far more effective than an f]/' of NaOH. Ik t,.A)OVdo-l 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 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 (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" 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 at 2°C. Which solvent would be better for recrystallization 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 elution (1 = first).
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This note was uploaded on 03/25/2012 for the course CHEM 3112 taught by Professor Staff during the Spring '11 term at Oklahoma State.

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

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