2010 Ochem Lab Exam 2 - CHEM 3112 Exam 2 Name TA(circle...

Info icon This preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
CHEM 3112 April 20, 2010 Exam 2 Name TA (circle yours) Sachin Todd Gerard Sam Sathish Lakshmi Charmaine Farai For full and partial credit, SHOW ALL Of YOUR WORK! Keep your answers short and to the point! Some eqlUations and tables for IR and NMR are provided on the back page. Grades will be available Thursday, April 29. Please do not ask before then as there are several items left to be graded.
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
., t Use the information in the procedure given on the back page to answer the questions on the next four pages. You may detach the last page. Complete the reaction below by filling in the boxes. o : o if 1. NaOCI, : I ~ ~NaOH ... : ~ 2. HCI : 1 o ~\ .. ot-( ~. ~~~: .st. oH 1 1 I JlJOz...I 1 ____ .J 1 ______ --------- Product 1 (benzoic acid) Product 2 Product 3 Physical Properties of Reactants and Products Compound MW mp/bp rC) density Acetophenone (2 o. ( bp 202 1.03 q/hL. Product 1 122.1 mp 120-121 /' (benzoic acid) r-'-- Product 2 167.12 mp 139-141 Product 3 I \ 81. ~ mp 79-80 bp 279 /" Methanol 32.04 bp 64.7 0.791 5(f'AL Sulfuric acid 98.1 bp 290 1.840 Calculate the molecular weight of: Acetophenone ~(I'J.O ~ * (IS .~j) T es( I '~ \ :: t~o t_{ 1.-.,., 120.t 5/ {Mol l Product 3 Step 1 What is the mass of 3 mL of acetophenone? d ';. j(,>, L ?>~\ (l'~2 ) ,,~ 3.0'11 ac<rvpk~'J How many mL of bleach should be used in the reaction?
Image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
.. ., () () k '1 -.1 I ~ ('"N,.O£J ... 4 l~OC(\)' 9What chemical s ma e up the 01 y layer? (VIC- [ltASic /' _ _'I€:. ...... '" " IV' Why does the oily layer disappear? Be specific. K I -r1 I d's + C' ·secJ up , .... , ~ iC'o,r -" ( /''It Oty'~r rSc.,pl"ec.~'S IJ I,.f c:.. ,. l J "" era., ~ /' O)Cld C'2.L rkc.. Gee. ~ f f\CI"'l-t'- (--:,. b('V'1zv l (. cc;..J.) V What should be observed with the qddition of HCI to the reaction mixture? V HC! I ~ a.. c~tc.I\1 s+ ~+ o.,Ni({ Sd ve as c:::... pFbf-.:.1"\ Sourct". whel'l aclt1eeR .\-hi5 will forfV\ tL proJuc:J- bc",~o(c. qc.icJ. BonusbWrite the reaction that takes place with the addition of HCI. ~\...~~ ~ t1/ ~ 0 H - L\ .... C2r"OI-' Step 2 Draw the set-up needed for the isolation. Label the equipment. (\ I f-c.{ p:<iX' lied /'" ,t JL. vlto.. f'i' '~ BuchM'( I tlA.h,rj (~';.;.J\<'R / G"'''cI l"''/ ~ - e --------., \' r-----( \L;= \, ~/ I " ""~-, Bonus: Why is the m- form of Product 2 formed in the reaction instead of 0- or p-? o II - c.OH r3> What is the most likely effect of not washing the isolated product? J 'Sol,J rMpt.<(I'rt<:'S, 11'\ ~ prbc.hl<:J-. Why is cold solvent used to wash crystallized products rather than room temperature or hot 2 solvent? 8erCH~$(' '/0« I.::Arc h- t ''''5 ,~ kke o I.,\.+ Htc.. 'MplAnh'e"5, Step 3 How many rnmol is 2.46 g of Product 2? 15
Image of page 4
( ~j\~ lr"l( ) / If 2.46 g of Product 2 is available for the reaction, how much methanol should be used? I ~ 1- 7·l\r.y{OOS ~ '52 ,r :14 ",L %'. ~ cL '1 ",L ,.,<\-1.,,:, j What is the role of H 2 S0 4 in the reaction? C~f.e..lys+ What is reflux? - Pf'bcedl,.(~~ 6 c.Jal'f2L. r~,~J-;o'" ~l-")hC" I--lt... M"C!-u.c::c- 's bo;Kt'd" p~~ vqPO~ jO USes CL (Of'~l!'nS\:>r al'l() «.;Jed"c r. 'At-t. ~ c..()"~c,,,s.or a.~ ~ w".f,.r fN"'" P-::' -;;. b c.oo( 0,,0{ r~ - cOl\cle"S~ f'(oc..J /;,c.c..k.. ("in +hL MI ><.fv.rc . U-L 'vb1?~\S tu l·iC,,(,"cP' ..v"c.c. fk'1 What temperature would be required to maintain a good reflux without ruining the reaction by \ ~ overheating? ~ ( wkc(C. 'fou C~f\ ~c.h, o.N'~cut bv. rfW '5 YO!..l>s~:J") "V' ' List the basic steps in recrystallization.
Image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern