GC Analysis of Distillate Post-Lab Questions 1) In this experiment we injected t
ID: 905891 • Letter: G
Question
GC Analysis of Distillate Post-Lab Questions
1) In this experiment we injected the sample to be analyzed by Gas Chromatograph
equipped with an FID (Flame Ionization Detector). The detector ionizes the sample as it
reaches it, and the peak is proportional to the number of ions with a live flame. A
chemist performed a distillation of methanol and water and wanted to analyze the results
using the same GC instrument with FID. Could he use a similar procedure to analyze the
results of his experiment? Explain why yes or no?
2. Ethylbenzene and o-xylene can be separated and analyzed using GC without injecting an
equimolar standard to a high accuracy. Explain why that is the case for these two
compounds while we had to inject an equimolar solution for our experiment.
3. The separation of two liquids on the GC is very similar to the distillation process.
Compare the two methods describing the process while pointing out to the similarities
and differences between the two methods.
Explanation / Answer
Yes. We use same GC instrument with FID (Flame ionization detector). FID measures the number of ions produced. The peak intensity is proportional to number of ions. Both water and methanol produce two ions.
Both ethyl benzene and o-xylene are non-polar compounds, so these are easily passed through the Gas chromatography column. Among the both compounds goes faster than the o-xylene. Thus, these compounds cannot be injected in equimolar mixture.
Distillation and gas chromatography are used to separate the compounds in a mixture based on their boiling point difference.
Gas chromatography is used to separate the compounds in small scale. Where as in distillation process, we can separate the compounds in large scale.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.