... Johns Melting Point Apparatus and the methods and procedure as outlined on page 9 in the Chemistry 3350: Organic Chemistry Laboratory Manual, Ed. 6(Morante, 2004) were followed. Results Sublimation The following results were found for the sublimation of the impure sample of 1,4 dichlorobenzene. Sublimation cont'd Mass of pure substance yielded was calculated weighing by difference. I obtained the mass of the weigh boat and then the mass of the weigh boat plus sublimed substance and then calculated the difference which gave me the amount of substance sublimed. Mass of Weigh boat----------------------------->0.5148 g Mass of Weigh boat + compound sublimed-->0.5947g Compound sublimed----------------------------->0.0799g Percent Yield was calculated: Percent Yield = Actual Amount x 100 = 0.799 x 100 = 0.307% Total Amount 26 Recrystallization The following results were found for the recrystallization of brown sugar. Mass of pure substance yielded was calculated weighing by difference. I obtained the mass of the weigh boat and then the mass of the weigh boat plus sublimed substance ...

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