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Thread: Question about fractional and simple distillation

  1. #1 Question about fractional and simple distillation 
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    If you are running a distillation experiment and notice that the measured boiling point of a substance is different from the literature value bp taken at 760 mm Hg is different, theoretically speaking if the atmospheric pressure in the lab room is not 760 mm Hg might this be one reason why the boiling point point to be different from the literature value?


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  3. #2  
    Forum Ph.D.
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    yes ,but not by very much


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  4. #3  
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    Altitude compared to Sea Level Boiling Point
    (ft) (m) (oF) (oC)
    -1000 -305 213.9 101.1
    -750 -229 213.5 100.8
    -500 -152 213.0 100.5
    -250 -76 212.5 100.3
    0 0 212.0 100.0
    250 76 211.5 99.7
    500 152 211.0 99.5
    750 229 210.5 99.2
    1000 305 210.1 98.9
    1250 381 209.6 98.6
    1500 457 209.1 98.4
    1750 533 208.6 98.1
    2000 610 208.1 97.8
    2250 686 207.6 97.6
    2500 762 207.2 97.3
    2750 838 206.7 97.1
    3000 914 206.2 96.8
    3250 991 205.7 96.5
    3500 1067 205.3 96.3
    3750 1143 204.8 96.0
    4000 1219 204.3 95.7
    4250 1295 203.8 95.5
    4500 1372 203.4 95.2
    4750 1448 202.9 94.9
    5000 1524 202.4 94.7
    5250 1600 202.0 94.4
    5500 1676 201.5 94.2
    5750 1753 201.0 93.9
    6000 1829 200.6 93.6
    6250 1905 200.1 93.4
    6500 1981 199.6 93.1
    6750 2057 199.2 92.9
    7000 2134 198.7 92.6
    7250 2210 198.2 92.4
    7500 2286 197.8 92.1
    7750 2362 197.3 91.8
    8000 2438 196.9 91.6
    8250 2515 196.4 91.3
    8500 2591 196.0 91.1
    8750 2667 195.5 90.8
    9000 2743 195.0 90.6
    9250 2819 194.6 90.3
    9500 2896 194.1 90.1
    9750 2972 193.7 89.8
    10000 3048 193.2 89.6
    10250 3124 192.8 89.3
    10500 3200 192.3 89.1
    10750 3277 191.9 88.8
    11000 3353 191.4 88.6
    11250 3429 191.0 88.3
    11500 3505 190.5 88.1
    11750 3581 190.1 87.8
    12000 3658 189.7 87.6
    12250 3734 189.2 87.3
    12500 3810 188.8 87.1
    12750 3886 188.3 86.8
    13000 3962 187.9 86.6
    13250 4037 187.4 86.4
    13500 4115 187.0 86.1
    13750 4191 186.6 85.9
    14000 4267 186.1 85.6
    14250 4343 185.7 85.4
    14500 4420 185.3 85.1
    14750 4496 184.8 84.9
    15000 4572 184.4 84.7
    15250 4648 184.0 84.4
    15500 4724 183.5 84.2
    15750 4801 183.1 83.9
    16000 4877 182.7 83.7
    16250 4953 182.2 83.5
    16500 5029 181.8 83.2
    16750 5105 181.4 83.0
    17000 5182 180.9 82.7
    17250 5258 180.5 82.5
    17500 5334 180.1 82.3
    17750 5410 179.7 82.0
    18000 5486 179.2 81.8
    18250 5563 178.8 81.6
    18500 5639 178.4 81.3
    18750 5715 178.0 81.1
    19000 5791 177.6 80.9
    19250 5867 177.1 80.6
    19500 5944 176.7 80.4
    19750 6020 176.3 80.2
    20000 6096 175.9 79.9
    20250 6172 175.5 79.7
    20500 6248 175.1 79.5
    20750 6325 174.7 79.3
    21000 6401 174.2 79.0
    21250 6477 173.8 78.8
    21500 6553 173.4 78.6
    21750 6629 173.0 78.3
    22000 6706 172.6 78.1
    22250 6782 172.2 77.9
    22500 6858 171.8 77.7
    22750 6934 171.4 77.4
    23000 7010 171.0 77.2
    23250 7087 170.6 77.0
    23500 7163 170.2 76.8
    23750 7239 169.8 76.5
    24000 7315 169.4 76.3
    24250 7391 169.0 76.1
    24500 7468 168.6 75.9
    24750 7544 168.2 75.6
    25000 7620 167.8 75.4
    25250 7696 167.4 75.2
    25500 7772 167.0 75.0
    25750 7849 166.6 74.8
    26000 7925 166.2 74.5
    26250 8001 165.8 74.3
    26500 8077 165.4 74.1
    26750 8153 165.0 73.9
    27000 8230 164.6 73.7
    27250 8306 164.2 73.5
    27500 8382 163.8 73.2
    27750 8458 163.4 73.0
    28000 8534 163.1 72.8
    28250 8611 162.7 72.6
    28500 8687 162.3 72.4
    28750 8763 161.9 72.2
    29000 8839 161.5 72.0
    29250 8916 161.1 71.7
    29500 8992 160.7 71.5
    29750 9068 160.4 71.3
    30000 9144 160.0 71.1
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