2) You have just finished a GC experiment using the standard additions method to determine the amount of toluene in a gasoline sample. The following results were obtained. % toluene toluene internal reference Peak added peak area peak area Ratio 28.918 8.988 1 37.142 9.034 45.364 9.502 3 53.590 9.598 4 61.812 9.139 70.038 9.189
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- What do you understand by Isocratic and Gradient elution?What effect will the following have on plate height (H). Make sure to explain your full and complete reasoning. Increasing stationary phase thickness. Reducing the rate of sample injection. Increasing mobile phase flow rate. Decreasing temperature. Reducing stationary phase particle size.One method for the quantitative determination of the concentration of constituents in a sample analyzed by gas chromatography is area normalization. Here, complete elution of all the sample constituents is necessary. The area of each peak is then measured and corrected for differences in detector response to the different eluates. This correction involves dividing the area by an empirically determined correction factor. The concentration of the analyte is found from the ratio of its corrected area to the total corrected area of all peaks. For a chromatogram containing three peaks, the relative areas were found to be 16.4, 45.2 and 30.2, in order of increasing retention time. Calculate the percentage of each compound if the relative detector responses were 0.60, 0.78 and 0.88, respectively.
- Why is the blank solution needed in spectrophotometry? A. A blank solution is used to clean the spectrophotometer b. A blank solution is used to calibrate the spectrophotometer readings: they document the baseline response of the environment- instrument- sample systemCan you tell me if I am doing this correctly? For the thermoeter correction, we are given that: literature value of standard - experimental value of standard at end of melting temperature. I found online that the melting range of pure acetanilide is 113-115. From there I calculated the therometer correction. Substance Melting Point Range Begins/Ends (oC) Interval of Melting (oC) Thermometer Correction for Calibration Data (oC) Corrected Melting Point (oC) Crystallized acetanilide Trial #1 111.9 – 112.9 1.0 2.1 Crystallized acetanilide Trial #2 111.0 – 112.3 1.3 2.7 Crude acetanilide 112.9-115.4 2.5 -0.4 Acetanilide standard Lot # 115.6-116.5 0.9 -1.5 N/APlot the following data and perform linear regression to obtain the value of the slope, the value of the y-intercept, and the correlation coefficient r. x- axis y-axis ln(0) 4.6052 0.0000 3.8712 0.6931 3.4012 1.0986 2.7081 1.3863 2.1972 1.6094 1.7918 1.7918 1.0986 1.9459 0.0000
- As used in the definition of a sampling distribution, "all possible random samples refers toGood day I have asked this question already this question is from the lesson about refractometry and I belive that its about linear regression which I don't know how to get the missing value. 28-31. A calibration curve was created, and the results has beenestablished and showed in the table, Assume the following data, Supply the missing value. n 1.55 1.65 1.70 1.80 ??? 1.62 Conc. 10% 15% 25% 35% 22% ??? 28-29.a. 1.66 c. 1.70b. 1.68 d. 1.72 30-31.a. 14.24 c. 16.24b. 15.24 d.17.24A standard solution was prepared containing 10.0 ppm of an analyte and 15.0 ppm of an internal standard. Analysis of the sample gave signals for the analyte and internal standard of 0.155 and 0.233 (arbitrary units), respectively. Sufficient internal standard was added to an unknown sample to make it 15.0 ppm in the internal standard. Analysis of the unknown sample yielded signals for the analyte and internal standard of 0.274 and 0.198, respectively. Calculate the concentration of analyte in the unknown sample.
- What is the difference between isocratic and gradient elution?In this experiment, the problem is that the volume of the volumetric pipet is not accurately known (only 2 sig figs), so any density calculation will also be limited to 2 sig figs. Calibration increases the number of sig figs from 2 to 4. As a result, the density also increases from 2 to 4 sig figs. Explain how and why this is possible.a- Separation is essential in chemical analysis especially when we are dealing with complexmixture of chemical species. Name 1 separation technique based on basis of operation asbelow. Basis of operation Techniquei) Sizeii) Mass and densityiii) Change in physical state