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Chapter_24_and_5_100405_Instructor

Chapter_24_and_5_100405_Instructor - Announcements Turn In...

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Announcements 1. Read Sections 5-3 and 5-4 in Chapter 5. 1. Begin reading Chapter 25 (HPLC). 1. The Review Sheet and Equation Sheet for Exam 2 has been posted on Blackboard under Handouts. 4. The solutions to Chapter 23 have been posted on Blackboard. 5. The solutions to the first chromatography problem set has been posted on Blackboard. 6. Exam 2: Tuesday, Oct. 18 th (CH 23, 24, 25, 26, and Parts of 5) Turn In Take Home Quiz
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Kovats Retention Index ( I )
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Kovats Retention Index ( I ) For Straight Chain Alkanes: I = n x 100, where n = # of carbon atoms Example: Ethane (CH 3 CH 2 CH 3 ) → I = 3 x 100 = 300 For Other, Non-Alkane Compounds: + = (n) t log - (N) t log (n) t log - (unknown) t log n) - (N n 100 I ' r ' r ' r ' r N = # of carbon atoms of longest chain alkane. n = # of carbon atoms of shortest chain alkane. t r = t r – t m = adjusted retention time.
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Kovats Retention Index ( I ) An analysis is performed on a mixture containing methane (C 1 ; CH 4 ), octane (C 8 ; CH 3 (CH 2 ) 6 CH 3 ), nonane (C 9 ; CH 3 (CH 2 ) 7 CH 3 ) and an unknown.
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