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Unformatted text preview: l. (30 pt.). After ﬁnishing successfully your 143A lab, you decided to use your knowledge and
prepare some homemade soap. You found the following procedure on the web: CH 000 CH CH ' 2 ( 2)16 s NaOH
CHZOOC(CH2)1SCH3 Place 1.62 g of glycerol tristearate in a round bottom ﬂask and add 14 mL of 1:1 ethanol-
water solution. Add 1.62 g of sodium hydroxide and reﬂux the solution for 30 minutes.
Cool the ﬂask to room temperature and transfer the reaction mixture into an Erlenmeyer
containing 7.2 g of NaCl in 27 mL water. Collect the solid by ﬁltration and wash it with
27 mL Of ice water. ‘ a. (6 pt.) Complete the above reaction
' b. (4 pt.) Why do you need to use a mixture of 1 :1 ethanol-water in the reaction?
0. (4 pt.) Why do you need toreﬂux the reaction?
c1. (4 pt.) The boiling point of ethanol is 78°C, therefore the temperature inside the
reaction ﬂask during the reﬂux will be:
II. 100°C 111. Between 78°C and 100°C
IV. Changing gradually from 78°C to 100°C e. (4 pt.) What is the chemical formula of the solid that was collected? r. _ (4 pt.) complete the following sentence:
NaCl is added to the water in order to g. (4 pt.) After the ﬁltration, the ﬁltrate (solution) will contain the following
compounds 5.‘ (25 pt.) Match the following IR spectra with the corresponding molecule. Write the
correct chemical structure in the box on the right side of the spectrum. . Cl
\ COOCHcha H30 0H ICOOH HO HO COO_
I / >—=—< CH30H2*CH\ >/ Can.
N HO. CH3 COOH Cl CN HQ 000
4000 3000 2000 1500 1000 nmmuu
3 non "Rainm-
B IW ammun-
S 0 ma toou 1 I“ Icon "60 Inv:num:m-| we ...
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- Spring '08
- Organic chemistry