A chemist prepared a reagent blank and 6 Fe standards with the following concentrations: 20, 30, 40, 50, 60, and 70 ppm. The table below shows the average reading of each run in the UV-Vis spectrophotometer. Concentration (ppm)-- --Absorbance (au) -0.121 20- 30--- -0.302 40- -0.468 50- -0.573 60- --0.696 70--- -0.845 Blank- -0.04 Which of the following is the correct equation for the calibration curve? (A) y = -0.1700 x + 0.01402 (B) y = 0.01402 x -0.1700 Cy=0.01402 x -0.1300 (D) y=-0.1300 x + 0.01402

A chemist prepared a reagent blank and 6 Fe standards with the following concentrations: 20, 30, 40, 50, 60, and 70 ppm. The table below shows the average reading of each run in the UV-Vis spectrophotometer. Concentration (ppm)-- --Absorbance (au) -0.121 20- 30--- -0.302 40- -0.468 50- -0.573 60- --0.696 70--- -0.845 Blank- -0.04 Which of the following is the correct equation for the calibration curve? (A) y = -0.1700 x + 0.01402 (B) y = 0.01402 x -0.1700 Cy=0.01402 x -0.1300 (D) y=-0.1300 x + 0.01402

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter25: Instruments For Optical Spectrometry

Section: Chapter Questions

Problem 25.14QAP

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Mass spectrometry is an extremely versatile detection system for GC. However, interfacing an HPLC system to a mass spectrometer is a much more difficult task. Describe the major reasons why it is more difficult to combine HPLC with mass spectrometry than it is to combine GC with mass spectrometry.
A chemist prepared a reagent blank and 6 Fe standards with the following concentrations: 20, 30, 40, 50, 60, and 70 ppm. The table below shows the average reading of each run in the UV-Vis spectrophotometer. Concentration (ppm)------------------------Absorbance (au) 20--------------------------------------------------0.121 30--------------------------------------------------0.302 40--------------------------------------------------0.468 50--------------------------------------------------0.573 60--------------------------------------------------0.696 70--------------------------------------------------0.845 Blank----------------------------------------------0.04 Which of the following is the correct equation for the calibration curve?
A chemist prepared a reagent blank and 6 Fe standards with the following concentrations: 20, 30, 40, 50, 60, and 70 ppm. The table below shows the average reading of each run in the UV-Vis spectrophotometer. Concentration (ppm)------------------------Absorbance (au) 20--------------------------------------------------0.121 30--------------------------------------------------0.302 40--------------------------------------------------0.468 50--------------------------------------------------0.573 60--------------------------------------------------0.696 70--------------------------------------------------0.845 Blank----------------------------------------------0.04 Which of the following is the correct equation for the calibration curve? y = 0.01402 x – 0.1700 y = 0.01402 x – 0.1300 y = -0.1300 x + 0.01402 y = -0.1700 x + 0.01402
Quinine in a 1.553-g antimalarial tablet was dissolved in sufficient 0.10 M HCl to give 250 mL of solution.A 10.00-mL aliquot was then diluted to 50.00 mL with the acid. The fluorescence intensity for the dilutedsample at 347.5 nm provided a reading of 196 on an arbitrary scale. A standard 100-ppm quinine solutionregistered 125 when measured under conditions identical to those for the diluted sample. Calculate the massin milligrams of quinine in the tablet.