Homework Help is Here – Start Your Trial Now!
Science
Chemistry
In lab, you will be participating in a study we have performed in previous semesters, analyzing beer. Samples of beer were measured for residual iron contamination. A calibration curve was made up using solutions of Fe(NO3)2 that were carefully made to accurate yield Fe concentrations given in the attached excel spreadsheet. Note that concentratiens are given in units of micrograms/Liter (* parts-per-billion by mass). Using the given calibration curve data, determine the concentration of Fe in each of indicated beers. Since there are three replicates of each calibration point and of each sample, you should use the average value of the three measurements for each sample. You do not need to be concerned about error analysis or experimental uncertainty in this particular problem.

In lab, you will be participating in a study we have performed in previous semesters, analyzing beer. Samples of beer were measured for residual iron contamination. A calibration curve was made up using solutions of Fe(NO3)2 that were carefully made to accurate yield Fe concentrations given in the attached excel spreadsheet. Note that concentratiens are given in units of micrograms/Liter (* parts-per-billion by mass). Using the given calibration curve data, determine the concentration of Fe in each of indicated beers. Since there are three replicates of each calibration point and of each sample, you should use the average value of the three measurements for each sample. You do not need to be concerned about error analysis or experimental uncertainty in this particular problem.

Chemistry
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
icon
Related questions
Question
Am i doing right on this?? Or wrong? (Determining conc of unknown using calibration curve)
9 Merge & Center v $ v % 9 Conditional Form Formatting as Ta 16 fx C F H J K M Sample Name Iron Replicate 1 Replicate 2 Replicate 3 average absorbance cocentration (micrograms Aiter) 1 2 Blank 3 10 ug/L Fe 4 100 ug/L Fe 5 500 ug/L Fe 6 1000 ug/L Fe 7 Bud Light 8 Juicy Haze 9 Landshark Sh to be determined 10 Leinenkugel to be determined 0.0 158.8591 307.6801 156.8378 309.6222 895.1578 159.3128 308.7295 158.3365667 10.0 308.6772667 894.8291667 0.289923422 .0 893.4536 100 500.0 1000.0 to be determined to be determined 895.8761 0.752158908 2984,987 5962.917 2931.439 2971.704 2962.71 1.27210792 5925,558 6029.956 1.5765975 1.283142283 5972.810333 3054.931 3038.327 3023,591 3038.949667 112.7512 113.222 113.1685 113.0472333 -0.146321285 226.8524 226.6448 212.4527 226.6448 226.714 0.155897116 213.4358 212.1578 212.6821 0.128149716 11 12 13 14 15 Chart Title 16 2 17 18 y= 0.0014x + 0.3275 R =0,8415 18 19 1.6 20 1.4 21 12 22 1 23 24 0.8 25 0.6 26 0.4 0.4 27 02 28 29 30 0.0 200.0 400.0 600.0 800.0 1000.0 1200.0 31 32 33 34 35 36 37 38 39 40 41 42
Transcribed Image Text:9 Merge & Center v $ v % 9 Conditional Form Formatting as Ta 16 fx C F H J K M Sample Name Iron Replicate 1 Replicate 2 Replicate 3 average absorbance cocentration (micrograms Aiter) 1 2 Blank 3 10 ug/L Fe 4 100 ug/L Fe 5 500 ug/L Fe 6 1000 ug/L Fe 7 Bud Light 8 Juicy Haze 9 Landshark Sh to be determined 10 Leinenkugel to be determined 0.0 158.8591 307.6801 156.8378 309.6222 895.1578 159.3128 308.7295 158.3365667 10.0 308.6772667 894.8291667 0.289923422 .0 893.4536 100 500.0 1000.0 to be determined to be determined 895.8761 0.752158908 2984,987 5962.917 2931.439 2971.704 2962.71 1.27210792 5925,558 6029.956 1.5765975 1.283142283 5972.810333 3054.931 3038.327 3023,591 3038.949667 112.7512 113.222 113.1685 113.0472333 -0.146321285 226.8524 226.6448 212.4527 226.6448 226.714 0.155897116 213.4358 212.1578 212.6821 0.128149716 11 12 13 14 15 Chart Title 16 2 17 18 y= 0.0014x + 0.3275 R =0,8415 18 19 1.6 20 1.4 21 12 22 1 23 24 0.8 25 0.6 26 0.4 0.4 27 02 28 29 30 0.0 200.0 400.0 600.0 800.0 1000.0 1200.0 31 32 33 34 35 36 37 38 39 40 41 42
2. In analytical measurements based on emission spectroscopy (such as fluorescence measurements and atomic emission spectroscopies), the signal being measured (e.g., intensity of light emitted) is strongly dependent on the design of the instrument used. As a result, conversion of measured intensities to concentrations relies on the use of calibration curves that have to be made and run each time, along with measurement of the actual samples of interest. Calibration curves are usually run on a daily basis, and sometimes even more frequently. In lab, you will be participating in a study we have performed in previous semesters, analyzing beer. Samples of beer were measured for residual iron contamination. A calibration curve was made up using solutions of Fe(NO3)2 that were carefully made to accurate yield-Fe concentrations given in the attached excel spreadsheet. Note that concentrations are given in units of micrograms/Liter (* parts-per-billion by mass). Using the given catibration curve data, determine the concentration of Fe in each of indicated beers. Since there are three replicates of each calibration point and of each sample, you should use the average value of the three measurements for each sample. You do not need to be concerned about error analysis or experimental uncertainty in this particular probtem.
Transcribed Image Text:2. In analytical measurements based on emission spectroscopy (such as fluorescence measurements and atomic emission spectroscopies), the signal being measured (e.g., intensity of light emitted) is strongly dependent on the design of the instrument used. As a result, conversion of measured intensities to concentrations relies on the use of calibration curves that have to be made and run each time, along with measurement of the actual samples of interest. Calibration curves are usually run on a daily basis, and sometimes even more frequently. In lab, you will be participating in a study we have performed in previous semesters, analyzing beer. Samples of beer were measured for residual iron contamination. A calibration curve was made up using solutions of Fe(NO3)2 that were carefully made to accurate yield-Fe concentrations given in the attached excel spreadsheet. Note that concentrations are given in units of micrograms/Liter (* parts-per-billion by mass). Using the given catibration curve data, determine the concentration of Fe in each of indicated beers. Since there are three replicates of each calibration point and of each sample, you should use the average value of the three measurements for each sample. You do not need to be concerned about error analysis or experimental uncertainty in this particular probtem.
Expert Solution
Step 1

Absorbance and concentration are related as follows:

A = ∈cl

Because of the linear relationship, the graph between absorbance and concentration is a best fit straight line.

trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 2 steps

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Knowledge Booster
Applications of Molecular Spectroscopy
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.
Similar questions
Recommended textbooks for you
Chemistry
Chemistry
Chemistry
ISBN:
9781305957404
Author:
Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:
Cengage Learning
Chemistry
Chemistry
Chemistry
ISBN:
9781259911156
Author:
Raymond Chang Dr., Jason Overby Professor
Publisher:
McGraw-Hill Education
Principles of Instrumental Analysis
Principles of Instrumental Analysis
Chemistry
ISBN:
9781305577213
Author:
Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:
Cengage Learning
Organic Chemistry
Organic Chemistry
Chemistry
ISBN:
9780078021558
Author:
Janice Gorzynski Smith Dr.
Publisher:
McGraw-Hill Education
Chemistry: Principles and Reactions
Chemistry: Principles and Reactions
Chemistry
ISBN:
9781305079373
Author:
William L. Masterton, Cecile N. Hurley
Publisher:
Cengage Learning
Elementary Principles of Chemical Processes, Bind…
Elementary Principles of Chemical Processes, Bind…
Chemistry
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY
SEE MORE TEXTBOOKS