(d) Explain why there may be a maximum operating temperature for the column and also why there has to be temperature control of the injector. (e) Flame lonisation (FI), Mass Spectrometric (MS) and Thermal Conductivity (TC) can all be used as detection techniques in GC. Discuss the advantages and disadvantages of each as a detection method. Which method is used in combustion analysis? (f) A solution of volume 1 mL, containing an equal parts mixture (by weight) of propofol and di-tertbutylphenol (a standard), was analysed by GC, which displayed peaks at retention times 5.80 min (area integration 2000) and 9.20 min (area integration 3500), respectively. An unknown solution, also volume 1 mL, was analysed under the same conditions and, among a number of other peaks, there was one at 5.80 min (area integration 4000). How could this be confirmed as propofol? In a subsequent analysis, 2.5 mg of di-tertbutylphenol was dissolved in the unknown solution and an extra peak appeared in the GC at 9.20 min (area integration 2000). Assuming that the peak at 5.80 min had been confirmed as propofol, determine its concentration (g L-¹) in the unknown sample and estimate the error in the determination.

(d) Explain why there may be a maximum operating temperature for the column and also why there has to be temperature control of the injector. (e) Flame lonisation (FI), Mass Spectrometric (MS) and Thermal Conductivity (TC) can all be used as detection techniques in GC. Discuss the advantages and disadvantages of each as a detection method. Which method is used in combustion analysis? (f) A solution of volume 1 mL, containing an equal parts mixture (by weight) of propofol and di-tertbutylphenol (a standard), was analysed by GC, which displayed peaks at retention times 5.80 min (area integration 2000) and 9.20 min (area integration 3500), respectively. An unknown solution, also volume 1 mL, was analysed under the same conditions and, among a number of other peaks, there was one at 5.80 min (area integration 4000). How could this be confirmed as propofol? In a subsequent analysis, 2.5 mg of di-tertbutylphenol was dissolved in the unknown solution and an extra peak appeared in the GC at 9.20 min (area integration 2000). Assuming that the peak at 5.80 min had been confirmed as propofol, determine its concentration (g L-¹) in the unknown sample and estimate the error in the determination.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Similar questions

any help with this question would be amazing
Eºcell = 0.050 V. If the concentration of Y2+ = 0.025 M, what molar concentration of X3+ would be needed to have E = 0? Fill in the intermediate values requested below and the final answer. Use T = 298 K, R = 8.314 J/molk, and F = 96485 C/mol
Calculate the solubility at 25 °C of PbCO3 in pure water and in a 0.0100M Pb(NO3), solution. You'll find Ksp data in the ALEKS Data tab. Round both of your answers to 2 significant digits. 0 // solubility in pure water: x10 solubility in 0.0100 M Pb(NO3)2 0-/- solution: L X 09 00 X S ?
I need the answer as soon as possible
Kindly answer this question
Discuss the similarities and differences of the following terms in the calibration of a particular type of equipment or instrument: TC and TD calibration in volumetric flask;
Chapter #6, Question #4: A fly ash (ƿ = 1.8 g mL-1) aerosol consists of particles averaging 13 µm in diameter and with a concentration of 800 µg m-3. Use the average diameter to calculate the settling velocity (cm s-1) and settling rate (g m-2 s-1) of the particles in still air.
A spectrometry method was applied to determine component A in solution. The result is shown in the table. Supposing an unknown sample gives result of 525, 536, 529, please calculate the concentration of A in the sample. \table [[C (u),0.00, 1.00, 2.00, 4.00, 8.00, 16.00], [1, 1.2, 110, 216, 445,869, 1750]] A m J c 1) A spectrometry method was applied to determine component A in solution. The result is shown in the table. Supposing an unknown sample gives result of 525, 536, 529, please calculate the concentration of A in the sample. CA (ug/ml) 0.00 1.00 2.00 4.00 8.00 16.00 I 1.2 110 216 445 869 1750
3-21 Complete this table for H,O: T, °C Р. КРа v, m³/kg Phase description 50 7.72 400 Saturated vapor 250 500 110 350
(4) Below are depictions of a student's TLC plates in which fractions 1 - 10 from their column are spotted. Lane 1 2 3 4 5 67 8 9 10 (a) Which fractions contain pure fluorenone? Which contain pure ferrocene? (b) Which lanes, if any, represent mixed fractions? (c) Would the student incorporate lanes 6 and 7 into an Erlenmeyer flask of a combined fraction? Explain with 10 words or less.
(4c) Consider a situation where phenol is partitioned between water and benzene with a partitioncoefficient of 1.35in favour of benzene. Suppose we have 2g of phenol dissolved in 250ml of water. How muchphenol will be extracted into 250ml of benzene with a single extractionand howmuch phenol is left in water?.
Answer (I) (ii) (iii)