Purification Of Benzil

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Purification and Identification of a Solid Compound Sara Dutra September 28, 2015 The first objective was to purify benzil using recrystallization and to determine the melting point of the pure benzil as well as the impure benzil. The second objective was to purify an unknown compound using recrystallization and to identify the unknown compound using its melting point. Compared to the melting point of a pure substance, the melting point of an impure mixture will have a larger range and will melt at a lower temperature. The identity of the unknown compound was determined by mixing the unknown with various known substances and testing the melting points of these mixtures to compare to the melting point of the unknown itself. Experimental…show more content…
50 mL of ethanol was measured and placed in a 150 mL beaker. The beaker of ethanol was placed on a hot plate, until it came to a boil. 15 mL of this hot ethanol was added to the benzil. This mixture was heated, while stirred, until it was almost boiling. Small amounts of hot ethanol were added to the mixture until all of the benzil was dissolved. Another 150 mL beaker with a small amount of ethanol and a short neck funnel was heated on the hotplate as well. When all of the benzil had dissolved, the hot solution was poured through an 11cm filter paper in the short neck funnel in order to remove impurities that did not dissolve in the solution. When all of the liquid had been filtered through the funnel, the beaker was removed from the hot plate and the funnel was removed from the beaker. The beaker was left to cool to room temperature. Once it reached room temperature, the beaker was placed in an ice bath for about 30 minutes, or until crystallization…show more content…
The tubes were placed in MEL-TEMP and set to a relatively high setting (3-4) in order to get a preliminary melting temperature. After a preliminary melting range was recorded, three more capillary tubes were filled, two with pure benzil and one with impure benzil. After waiting for the MEL-TEMP to cool, these three capillary tubes were placed in the MEL-TEMP, which was set to increase at about 2° a minute, and recorded their melting points. To determine the melting point of the unknown substance, the same process of first finding a preliminary range, and then determining a more specific melting point was used. After the melting point of the unknown had been determined, three known compounds that had melting points similar to that of our unknown were gathered. Each of these compounds was mixed with the unknown and the melting point of the mixtures of each of these was
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