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Questions: 1. The order of elution usually follows the order of boiling points. That is compounds with low boiling points elute and those with higher boiling points elute later. Why do you think this is so? 2. In which part of the experiment is random error the greatest? Is it the solution preparation where all the reagents are weighed and mixed? Is it the injection where the volumes are ~1 μã? Is it in the instrumentation? 3. What is the difference between a systematic error and a random error? Internal standard experiments really change what was a random error into a systematic error and then the systematic error is then corrected. Explain this in terms of our experiment. appropriate to say that the area under a peak is proportional to the amount of moles (not concentration) passing through the detector. Why do you think this is true? But then we relate areas to co that be true too? 5. (a) When a solution containing 234 mg of pentanol (FM 88.15) and 237 mg of 2,3-dimethyl1-2-butanol (FM 102.17) in 10.0 mL was separated, the relative peak areas were pentanol:2,3-dimethyl-2-butanol-0.913:1.00. Considering pentanol to be the internal standard, find the response factor for 2,3-dimethyl-2-butanol. (b) The unknown gave peak areas of 158 for pentanol and 164 for 2,3-dimethyl-2-butanol. The concentration of pentanol internal standard in the unknown solution was 93.7 mM. What was the concentration of 2,3-dimethyl-2-butanol? A standard solution containing 6.3x10 M iodoacetone and 2.0x10-7 M p-dichlorobenzene (an internal standard) gave peak areas of 395 and 787, respectively, in a gas chromatogram. A 3.00-mL unknown solution of iodoacetone was treated with 0.100 mL of 1.6x10-5 M p-dichlorobenzene and the mixture was diluted to 10.00 mL Gas chromatography gave peak areas of 633 and 520 for iodoacetone and p-dichlorobenzene, respectively. Find the concentration of iodoacetone in the 3.00 mL of original unknown. Show transcribed image text Questions: 1. The order of elution usually follows the order of boiling points. That is compounds with low boiling points elute and those with higher boiling points elute later. Why do you think this is so? 2. In which part of the experiment is random error the greatest? Is it the solution preparation where all the reagents are weighed and mixed? Is it the injection where the volumes are ~1 μã? Is it in the instrumentation? 3. What is the difference between a systematic error and a random error? Internal standard experiments really change what was a random error into a systematic error and then the systematic error is then corrected. Explain this in terms of our experiment. appropriate to say that the area under a peak is proportional to the amount of moles (not concentration) passing through the detector. Why do you think this is true? But then we relate areas to co that be true too? 5. (a) When a solution containing 234 mg of pentanol (FM 88.15) and 237 mg of 2,3-dimethyl1-2-butanol (FM 102.17) in 10.0 mL was separated, the relative peak areas were pentanol:2,3-dimethyl-2-butanol-0.913:1.00. Considering pentanol to be the internal standard, find the response factor for 2,3-dimethyl-2-butanol. (b) The unknown gave peak areas of 158 for pentanol and 164 for 2,3-dimethyl-2-butanol. The concentration of pentanol internal standard in the unknown solution was 93.7 mM. What was the concentration of 2,3-dimethyl-2-butanol? A standard solution containing 6.3x10 M iodoacetone and 2.0x10-7 M p-dichlorobenzene (an internal standard) gave peak areas of 395 and 787, respectively, in a gas chromatogram. A 3.00-mL unknown solution of iodoacetone was treated with 0.100 mL of 1.6x10-5 M p-dichlorobenzene and the mixture was diluted to 10.00 mL Gas chromatography gave peak areas of 633 and 520 for iodoacetone and p-dichlorobenzene, respectively. Find the concentration of iodoacetone in the 3.00 mL of original unknown.
Questions: 1. The order of elution usually follows the order of boiling points. That is compounds with low boiling points elute and those with higher boiling points elute later. Why do you think this is so? 2. In which part of the experiment is random error the greatest? Is it the solution preparation where all the reagents are weighed and mixed? Is it the injection where the volumes are ~1 μã? Is it in the instrumentation? 3. What is the difference between a systematic error and a random error? Internal standard experiments really change what was a random error into a systematic error and then the systematic error is then corrected. Explain this in terms of our experiment. appropriate to say that the area under a peak is proportional to the amount of moles (not concentration) passing through the detector. Why do you think this is true? But then we relate areas to co that be true too? 5. (a) When a solution containing 234 mg of pentanol (FM 88.15) and 237 mg of 2,3-dimethyl1-2-butanol (FM 102.17) in 10.0 mL was separated, the relative peak areas were pentanol:2,3-dimethyl-2-butanol-0.913:1.00. Considering pentanol to be the internal standard, find the response factor for 2,3-dimethyl-2-butanol. (b) The unknown gave peak areas of 158 for pentanol and 164 for 2,3-dimethyl-2-butanol. The concentration of pentanol internal standard in the unknown solution was 93.7 mM. What was the concentration of 2,3-dimethyl-2-butanol? A standard solution containing 6.3x10 M iodoacetone and 2.0x10-7 M p-dichlorobenzene (an internal standard) gave peak areas of 395 and 787, respectively, in a gas chromatogram. A 3.00-mL unknown solution of iodoacetone was treated with 0.100 mL of 1.6x10-5 M p-dichlorobenzene and the mixture was diluted to 10.00 mL Gas chromatography gave peak areas of 633 and 520 for iodoacetone and p-dichlorobenzene, respectively. Find the concentration of iodoacetone in the 3.00 mL of original unknown.
Show transcribed image text Questions: 1. The order of elution usually follows the order of boiling points. That is compounds with low boiling points elute and those with higher boiling points elute later. Why do you think this is so? 2. In which part of the experiment is random error the greatest? Is it the solution preparation where all the reagents are weighed and mixed? Is it the injection where the volumes are ~1 μã? Is it in the instrumentation? 3. What is the difference between a systematic error and a random error? Internal standard experiments really change what was a random error into a systematic error and then the systematic error is then corrected. Explain this in terms of our experiment. appropriate to say that the area under a peak is proportional to the amount of moles (not concentration) passing through the detector. Why do you think this is true? But then we relate areas to co that be true too? 5. (a) When a solution containing 234 mg of pentanol (FM 88.15) and 237 mg of 2,3-dimethyl1-2-butanol (FM 102.17) in 10.0 mL was separated, the relative peak areas were pentanol:2,3-dimethyl-2-butanol-0.913:1.00. Considering pentanol to be the internal standard, find the response factor for 2,3-dimethyl-2-butanol. (b) The unknown gave peak areas of 158 for pentanol and 164 for 2,3-dimethyl-2-butanol. The concentration of pentanol internal standard in the unknown solution was 93.7 mM. What was the concentration of 2,3-dimethyl-2-butanol? A standard solution containing 6.3x10 M iodoacetone and 2.0x10-7 M p-dichlorobenzene (an internal standard) gave peak areas of 395 and 787, respectively, in a gas chromatogram. A 3.00-mL unknown solution of iodoacetone was treated with 0.100 mL of 1.6x10-5 M p-dichlorobenzene and the mixture was diluted to 10.00 mL Gas chromatography gave peak areas of 633 and 520 for iodoacetone and p-dichlorobenzene, respectively. Find the concentration of iodoacetone in the 3.00 mL of original unknown. 1
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