2010 Ochem Lab Exam 2

2010 Ochem Lab Exam 2 - CHEM 3112 April 20, 2010 Exam 2...

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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.
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., 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?
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.. ., () () 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
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( ~j\~ lr"l( ) / If 2.46 g of Product 2 is available for the reaction, how much methanol should be used? I
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2010 Ochem Lab Exam 2 - CHEM 3112 April 20, 2010 Exam 2...

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