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11 Nov 2019
this is attachment for my last question .. .
approximatelyIto C. n mo would not have time to register the proper temperature and you wrong reading. (You would have a sharp melting point for the wrong reason 4. Record the melting point range by recording the temperature at whic appears, and the temperature at which the sample has melted entirely (e.g. 5. Turn off the apparatus and wait for it to cool for the next step 6. The d, you unknown should give you a narrow range. If a broad range is obtaine have made a mistake somewhere such as contaminating your unknown samp misreading the thermometer, in which case you should repeat steps I to 4 7. S elect a known compound from the list provided below which melts close to the same mp of your unknown. Make a 50:50 mixture of your unknown and the known. ash the mixture with a spatula to mix them thoroughly and do a mixed meting e unknown and known are identical in structure then the melting point be the same. If the known compound is different in structure from your have Continue to do mixed melting points with other possible compounds until you are certain of the identity of your unknown. Keep a good record of what you have done and include in your notebook (and in your lab report) the strategy you point. If th range will unknown compound then the melting point range will be very much lower and a wider range. are following in choosing what to mix with your unknown List of Melting Points of Possible Compounds for the Unknown Solid Name of Compound Known Known Name of Compound maleic acid urea benzoin mp (C) 4-chlorobenzophenon acetamide vanillin o-toluic acid azelaic acid m-toluic acid 75 80 81 108 109 113 120 135 134 135 149 151 p-acetotoluidide benzenesulfonamide adipic acid 4-acetamidophenol (or acetaminophen hydroquinone D(+) tartaric acid mandelic acid benzoic acid benzamide 122 128 172 172* *D(+) tartaric acid sometimes give a melting range of 160-170°C
this is attachment for my last question .. .
approximatelyIto C. n mo would not have time to register the proper temperature and you wrong reading. (You would have a sharp melting point for the wrong reason 4. Record the melting point range by recording the temperature at whic appears, and the temperature at which the sample has melted entirely (e.g. 5. Turn off the apparatus and wait for it to cool for the next step 6. The d, you unknown should give you a narrow range. If a broad range is obtaine have made a mistake somewhere such as contaminating your unknown samp misreading the thermometer, in which case you should repeat steps I to 4 7. S elect a known compound from the list provided below which melts close to the same mp of your unknown. Make a 50:50 mixture of your unknown and the known. ash the mixture with a spatula to mix them thoroughly and do a mixed meting e unknown and known are identical in structure then the melting point be the same. If the known compound is different in structure from your have Continue to do mixed melting points with other possible compounds until you are certain of the identity of your unknown. Keep a good record of what you have done and include in your notebook (and in your lab report) the strategy you point. If th range will unknown compound then the melting point range will be very much lower and a wider range. are following in choosing what to mix with your unknown List of Melting Points of Possible Compounds for the Unknown Solid Name of Compound Known Known Name of Compound maleic acid urea benzoin mp (C) 4-chlorobenzophenon acetamide vanillin o-toluic acid azelaic acid m-toluic acid 75 80 81 108 109 113 120 135 134 135 149 151 p-acetotoluidide benzenesulfonamide adipic acid 4-acetamidophenol (or acetaminophen hydroquinone D(+) tartaric acid mandelic acid benzoic acid benzamide 122 128 172 172* *D(+) tartaric acid sometimes give a melting range of 160-170°C