OCHEM Exp. 1

OCHEM Exp. 1 - Results After completing the...

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Hobbs, April Lab Results-Experiment 1 Recrystallization of an Unknown Solid Introduction In this experiment, we will be identifying an unknown compound through Recrystallization comparison of melting points. Table of Reagents Compound Melting point (ºC) vanilin 83 Ethyl 3,5- dinitrobenzoate 95 o-toluic acid 105 Acetanilide 115 Benzoic Acid 122 benzamide 130 m-nitrobenzoic acid 142 o-nitrobenzoic acid 148 Salicylic Acid 161 o-nitrobenzamide 178 p-anisic acid 185 Safety Information The unknown compounds in this experiment can be very dangerous if used without caution. These solids may cause eye irritation and respiratory tract irritation. Therefore, it is necessary to ALWAYS wear you lab glasses and always close the containers to avoid inhalation. Most importantly, wear the appropriate attire for lab to avoid skin irritation.
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Unformatted text preview: Results After completing the Recrystallization of the compound, we found that the melting point of our unknown compound (D) was 118C-120C. This corresponded with benzoic acids melting point of 122C. When we used benzoic acid to determine a mixed Hobbs, April Lab Results-Experiment 1 melting point, it was 119C-122C. This was less than a 5C difference to the melting point of our unknown. Conclusion We were able to conclude that our unknown compound (D) was benzoic acid. Our percent recovery was approximately 28.93%. Our percent recovery was not as high as we expected it to be due to splashing caused by the boiling of the solution. We tried to avoid this by adding more boiling chips and being sure to continue to swirl the solution over the heat....
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OCHEM Exp. 1 - Results After completing the...

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