Gas Chromatography: Purifying Alcohol
Gas Chromatography: Purifying alcohol
Introduction The goal of this lab is to understand the principles of chromatography by purifying alcohol using fractional distillation. Running standards with gas chromatography we were able to see and calibrate our data to find not only how much ethanol our alcohol attained but also what a mixed unknown sample contained. Chromatography is a way of being able to separate substances in solution that can help not only identify the analytes (the studied substances) but can determine their concentration. Finding out what is present gives us a qualitative analysis and finding out how much of the analyte is in the mixture gives us the quantitative analysis. The following picture shows the structure …show more content…
The vapor then proceeds through the column. The mobile phase is the gas and the column is the stationary phase. Every gas has different affinities at varying temperatures for the two phases. When the gas stops it is detected by the detector and recorded using the amount of time it took for the analyte to travel through the column. The time is the qualitative analysis because an analyte like ethanol will behave similar under similar conditions (the same temperature). So running standards to know what analytes are being absorbed at what times will let you know what the unknown is. The areas under your peaks will give you an estimate of what your concentration is. Again this will help find your concentration of your unknown. Concentration is directly related to the area. Here is a graph so you see what a read out would look …show more content…
One solution t tested out and the new standard deviation is .7. In which the average +/- this deviation is precise. The accuracy is measured by taking the concentration of say isopropyl in solution 1 which is 40% and substituting it in for y in the calibration curve for isopropyl. Y = 7E-05x - 0.0317. X gives us 6167 area units. Our measured answer is 5923. (6167-5923)/ 6167 is our percent error in decimal form .039 and that translate to about 4% error.
This experiment does a really good job explaining chromatography and applied principles it uses. On the basis of these results you can find mixtures to give different proofs of alcohol maybe you want 30% percent ethanol. Or a similar process is used in fuels like gasoline and kerosene. Chromatography has a wide variety of purposes and uses.
Works cited
School of Science and Mathematics. Retrieved April 16,2007, from Sheffield Hallam
University Website: http://teaching.shu.ac.uk/hwb/chemistry/tutorials/chrom/
Gashcrm.htm
Retrieved April 16, 2007, from Airsoft Wiki Website: http://airsoft.salmonbear.com/
Introduction The goal of this lab is to understand the principles of chromatography by purifying alcohol using fractional distillation. Running standards with gas chromatography we were able to see and calibrate our data to find not only how much ethanol our alcohol attained but also what a mixed unknown sample contained. Chromatography is a way of being able to separate substances in solution that can help not only identify the analytes (the studied substances) but can determine their concentration. Finding out what is present gives us a qualitative analysis and finding out how much of the analyte is in the mixture gives us the quantitative analysis. The following picture shows the structure …show more content…
The vapor then proceeds through the column. The mobile phase is the gas and the column is the stationary phase. Every gas has different affinities at varying temperatures for the two phases. When the gas stops it is detected by the detector and recorded using the amount of time it took for the analyte to travel through the column. The time is the qualitative analysis because an analyte like ethanol will behave similar under similar conditions (the same temperature). So running standards to know what analytes are being absorbed at what times will let you know what the unknown is. The areas under your peaks will give you an estimate of what your concentration is. Again this will help find your concentration of your unknown. Concentration is directly related to the area. Here is a graph so you see what a read out would look …show more content…
One solution t tested out and the new standard deviation is .7. In which the average +/- this deviation is precise. The accuracy is measured by taking the concentration of say isopropyl in solution 1 which is 40% and substituting it in for y in the calibration curve for isopropyl. Y = 7E-05x - 0.0317. X gives us 6167 area units. Our measured answer is 5923. (6167-5923)/ 6167 is our percent error in decimal form .039 and that translate to about 4% error.
This experiment does a really good job explaining chromatography and applied principles it uses. On the basis of these results you can find mixtures to give different proofs of alcohol maybe you want 30% percent ethanol. Or a similar process is used in fuels like gasoline and kerosene. Chromatography has a wide variety of purposes and uses.
Works cited
School of Science and Mathematics. Retrieved April 16,2007, from Sheffield Hallam
University Website: http://teaching.shu.ac.uk/hwb/chemistry/tutorials/chrom/
Gashcrm.htm
Retrieved April 16, 2007, from Airsoft Wiki Website: http://airsoft.salmonbear.com/