an exhibit shows a peak at 2.4 minutes in a gas chromatogram. a sample of known heroin also has a retention time of 2.4 minutes using the same instrument under the same conditions. the fact that both the unknown and the known have the same retention time is indicative of their being the same substance, but it does not prove this relationship. discuss?

an exhibit shows a peak at 2.4 minutes in a gas chromatogram. a sample of known heroin also has a retention time of 2.4 minutes using the same instrument under the same conditions. the fact that both the unknown and the known have the same retention time is indicative of their being the same substance, but it does not prove this relationship. discuss?

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter2: Basic Statistical Analysis With Excel

Section: Chapter Questions

Problem 4P

See similar textbooks

Similar questions

A student dissolves a Jefferson nickel to make 100.00 mL of solution in a volumetric flask. The student takes a 5.00 mL5.00 mL aliquot of the first solution and dilutes it to make 100.00 mL100.00 mL of a second solution. The student places a sample of the second solution in a cuvette for analysis using spectrophotometry. The molarity of the copper solution in the cuvette was determined by spectrophotometric analysis to be 2.90×10−2 M Cu.2.90×10−2 M Cu. Calculate the mass of copper in the Jefferson nickel used to make the first solution.
What kind of mixture of substance has Distillation and Chromatography has?
A mixture of cyclohexane (b.p 81 °C) and toluene (b.p 110.8 °C) need to be separated and collected without jeopadizing the purity of each component. What is the best method to isolate and collect each component? A. gas chromatography, because they can be separated and collected easily due to their boiling points differences. B. simple distillation, because their boiling points are differerent from each other by approximately 30 °C C.fractional distillation, because their boiling points are close to one another D.TLC, because these two compounds can be separated easily using an organic solvent such as hexanes
A calibrated flask has a mass of 0.02 kg when empty, 0.095 kg when filled with water, and 0.058 kg when filled with denatured alcohol. What is the density of the alcohol?
The spay used to develop the chromatogram is a solution of Group of answer choices a.) Ferrocyanide, ammonia, and iodide b.) Ammonia c.) Potassium permanganate d.) Potassium ferrocyanide
There are 48 pairs of students in the following table. Each pair has quantitatively determined the mass of caffeine in a 355 mL can of the popular energy drink marketed as “GRIME” using Liquid Chromatography-Mass Spectrometry (LC-MS). The class results are presented below. Summarise and report these results including an indication of measurement uncertainty. * Mass of Caffeine (mg) Mass of Caffeine (mg) (Table continued) 208.28 207.54 207.12 206.70 208.54 208.00 208.23 208.49 207.99 206.85 208.74 207.73 206.93 207.27 206.77 208.88 207.55 206.97 208.42 208.65 208.68 208.81 207.59 208.41 207.89 208.42 208.11 206.75 206.49 208.13 207.97 206.79 200.79 208.08 207.69 207.79 207.92 207.85 206.57 208.12 206.89 208.38 207.27 208.15 207.89 206.62 207.71 207.83
analytical balanceb. top-loading balancec. serological pipetted. graduated cylindere. burettef. volumetric flaskg. Erlenmeyer flaskh. beaker Define the term, “measurement uncertainty”. Among the instruments listed above, which ones have the highest uncertainty? Which ones have the lowest?
Tyler the titrating student did not rinse his buret properly and residual water (not titrant) was left in the buret prior to filling the buret with base. how would the Precision, Accuracy, and Mass of CaCO3 in antacid be affected?
Julie has been asked to measure the concentration of a sample solution using a spectrophotometer. After a first attempt, she realizes that, to make the measurement, she must first dilute the sample solution. Julie transfers 1.3 mL1.3 mL of the sample to a 250 mL250 mL volumetric flask and fills the rest of the flask with water to the 250 mL250 mL line. She then uses the spectrophotometer to measure the concentration of the dilute solution as 5.5×10−5 M.5.5×10−5 M. What is the concentration of the starting sample solution?
Please answer this question as fast as you can please and tahnk you. I will afterwards write an wonderful review on solving the question. Thank you. For each piece of glassware measure the density of water in triplicate (three times). Why repeat the procedure multiple times for each piece of glassware? Running the measurement in triplicate increases the precision of our results and reduces the impact of a single outlier result. The experiment would be too short if you only ran each trial once The first two trials act as practice, and the final trial will give you the true result. Running the measurement in triplicate increases the accuracy of our results and reduces the impact of a single outlier result.
Julie has been asked to measure the concentration of a sample solution using a spectrophotometer. After a first attempt, she realizes that, to make the measurement, she must first dilute the sample solution. Julie transfers 2.3 mL2.3 mL of the sample to a 250 mL250 mL volumetric flask and fills the rest of the flask with water to the 250 mL250 mL line. She then uses the spectrophotometer to measure the concentration of the dilute solution as 5.5×10−5 M.5.5×10−5 M. What is the concentration of the starting sample solution? sample solution concentration: M
What is chromatography, and how does it work?