A box arrives from an instrument vendor with the new HPLC system your company ordered. You have been asked to unpack the box so the instrument can be installed. As you unpack, you find a component that was apparently incorrectly included in the shipment. Which is the incorrect component? computer hardware and interface cables injection valve solvent mixing cell flame ionization detector absorbance detector with a low volume liquid cell software for instrument operation and data analysis stainless steel column packed with microparticulate silica that is chemically modified solvent degasser high pressure solvent pumps

A box arrives from an instrument vendor with the new HPLC system your company ordered. You have been asked to unpack the box so the instrument can be installed. As you unpack, you find a component that was apparently incorrectly included in the shipment. Which is the incorrect component? computer hardware and interface cables injection valve solvent mixing cell flame ionization detector absorbance detector with a low volume liquid cell software for instrument operation and data analysis stainless steel column packed with microparticulate silica that is chemically modified solvent degasser high pressure solvent pumps

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter27: Molecular Fluorescence Spectroscopy

Section: Chapter Questions

Problem 27.9QAP

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The amount of caffeine in an analgesic tablet was determined by HPLC using a normal calibration curve. Standard solutions of caffeine were prepared and analyzed using a 10-µL fixed-volume injection loop. Results for the standards are summarized in the following table. Concentration of Standards Signal (arbitrary units) (ppm) 50.0 8354 100.0 16925 150.0 25218 200.0 33584 250.0 42002 The sample was prepared by placing a single analgesic tablet in a small beaker and adding 10 mL of methanol. After allowing the sample to dissolve, the contents of the beaker, including the insoluble binder, were quantitatively transferred to a 25-mL volumetric flask and diluted to volume with methanol. The sample was then filtered, and a 1.00-mL aliquot was transferred to a 10-mL volumetric flask and diluted to volume with methanol. When analyzed by HPLC, the signal for the caffeine was found to be 21469. Report the number of milligrams of caffeine in the analgesic tablet.
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A student creates a Beer's Law calibration curve in the lab. The equation for the best fit line is given below: y = 2994x + 0.0901 The student used a cuvette with a path length of 1.00 cm to collect this data. Then, they tested the absorbance of a solution of unknown concentration. A = 0.135 Based on this information, answer the following questions. IMPORTANT NOTE: You will need to enter your answers in scientific notation. To do so, use a capital E and no spaces. Example: 123 becomes 1.23E2; 0.00123 becomes 1.23E-3 What is the value for ɛ, the molar absorptivity constant, for this compound? Enter your answer rounded appropriately for significant figures but without units. What is the concentration of the unknown solution? Enter your answer rounded appropriately for significant figures but without units.