Final Qs

Final Qs - l. (30 pt.). After finishing successfully your...

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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 CHOOC(CH2)150H3 --—--——.—> I HZO/CH30HZOH 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: I. 78°C 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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Final Qs - l. (30 pt.). After finishing successfully your...

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