CHM2210L-Exp2-Extraction-Spring2017

CHM2210L-Exp2-Extraction-Spring2017 - CHM2210L...

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Organic Chemistry Lab I Lecture  CHM 2210L  Lab Coordinator: Dr. Weldegirma Lab Lecturer: Mr. Johnson Office hours: By Appointment, NES 329
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Experiment 2:  Acid-Base Extraction: Separation  of an Organic Acid, a Base and a  Neutral Compound
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Aim of Experiment / Objective To separate a 1:1:1 mixture of benzoic acid, 4- chloroaniline  and  naphthalene  using  acid-base  extraction. The purity of the isolated compounds  will  be  examined  using  melting  point  comparison.
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Background Acid-Base Reactions Lewis  Definition:  Acid  accepts  electrons  and  base donates electrons through combination Brønsted-Lowry Definition: Acid donates proton  and base accepts proton through transfer. Remember This?: M 1 V 1 =M 2 V 2
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Background Extraction: Separation of substance from matrix Solid Phase Extraction Liquid-Liquid Extraction
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Background Melting Point Used to check purity of solid compounds Recorded as a range by heating 1-2  ° C/min Pure = <1  ° C from literature value + <1-2  ° melting point range
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Chemicals Used Benzoic Acid IUPAC Name: benzoic acid Formula: C 7 H 6 O 2   Molar Mass: 122.12 g/mol  Melting Point: 122.4  ° C Boiling Point: 249.2  ° C 4-Chloroaniline IUPAC Name: 4-chloroaniline Formula: C 6 H 4 ClN Molar Mass: 127.57 g/mol Melting Point: 72.5  ° C Boiling Point: 232  ° C
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Chemicals Used Naphthalene IUPAC Name: naphthalene
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