mp mixdmp tcalibration xcel graph & mp info 8-20-07

mp mixdmp tcalibration xcel graph & mp info 8-20-07 -...

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THERMOMETER CALIBRATION AND MELTING POINT DETERMINATIONS Dr. Haney Organic Chemistry Lab (3201 and 3202) UHD General Melting Point Guidelines Break up a tiny amount of the sample into a fine powder. Load this fine powder into the mp capillary and tap down to the closed end. Fill only about 1-2mm. Drop capillary down a glass tube at least 2 feet long to pack powder. Measure a quick preliminary mp (optional, if you know the expected or literature mp). Measure the melting point: place loaded mp capillary in the Mel-Temp and increase the temperature quickly at first and then VERY SLOWLY within 10 to 20 ° C of expected mp; Record the mp RANGE. If pure, the melting point range will be 1 to 2 degrees. Calibration of Your Thermometer Measure the temperature of three standard powders (acetanilide [114 ° C], cinnamic acid [133 ° C ], and salicylic acid [159 ° C ]. For these melting points, be sure to follow the general melting point guidelines given above; be especially careful to raise the temperature only 1 ° C per minute near the melting point and to record the melting point range that you observe. It is best to prepare a mp
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mp mixdmp tcalibration xcel graph & mp info 8-20-07 -...

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