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The following data was used to determine the concentration of arsenic in a river using atomic absorption spectrometry. Three replicate measurements were recorded for each sample and the absorbance values below are the averages. nc. As (ppb) Abs. 2.5 0.0297 0.0588 0.0782 0.1039 Unknown 0.0615 5.0 7.5 10.0 a. Graph the data and determine the slope and and intercept. Use Excel-possibly the LINEST function-to determine the standard error about the regression. This is the uncertainty in the absorbance. b. C. d. e. Calculate the concentration of the arsenic in ppb. Do not worry about rounding to the correct number of significant figures until part e of this question. Determine the absolute uncertainty (i.e., standard devation) of the arsenic concentration for the unknown. Write the As concentration and its standard deviation the correct number of significant figures.

The following data was used to determine the concentration of arsenic in a river using atomic absorption spectrometry. Three replicate measurements were recorded for each sample and the absorbance values below are the averages. nc. As (ppb) Abs. 2.5 0.0297 0.0588 0.0782 0.1039 Unknown 0.0615 5.0 7.5 10.0 a. Graph the data and determine the slope and and intercept. Use Excel-possibly the LINEST function-to determine the standard error about the regression. This is the uncertainty in the absorbance. b. C. d. e. Calculate the concentration of the arsenic in ppb. Do not worry about rounding to the correct number of significant figures until part e of this question. Determine the absolute uncertainty (i.e., standard devation) of the arsenic concentration for the unknown. Write the As concentration and its standard deviation the correct number of significant figures.

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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1. The following data was used to determine the concentration of arsenic in a river using atomic absorption spectrometry. Three replicate measurements were recorded for each sample and the absorbance values below are the averages. Conc. As (ppb) Abs. 2.5 0.0297 5.0 0.0588 7.5 0.0782 10.0 0.1039 Unknown 0.0615 a. Graph the data and determine the slope and and intercept. Use Excel-possibly the LINEST function- to determine the standard error about the regression. This is the uncertainty in the absorbance. b. C. d. e. Calculate the concentration of the arsenic in ppb. Do not worry about rounding to the correct number of significant figures until part e of this question. Determine the absolute uncertainty (i.e., standard devation) of the arsenic concentration for the unknown. Write the As concentration and its standard deviation to the correct number of significant figures.
Transcribed Image Text:1. The following data was used to determine the concentration of arsenic in a river using atomic absorption spectrometry. Three replicate measurements were recorded for each sample and the absorbance values below are the averages. Conc. As (ppb) Abs. 2.5 0.0297 5.0 0.0588 7.5 0.0782 10.0 0.1039 Unknown 0.0615 a. Graph the data and determine the slope and and intercept. Use Excel-possibly the LINEST function- to determine the standard error about the regression. This is the uncertainty in the absorbance. b. C. d. e. Calculate the concentration of the arsenic in ppb. Do not worry about rounding to the correct number of significant figures until part e of this question. Determine the absolute uncertainty (i.e., standard devation) of the arsenic concentration for the unknown. Write the As concentration and its standard deviation to the correct number of significant figures.
Expert Solution
Step 1: Writing down the given information

Given the data,

Concentration (ppb)Absorbance
2.50.0297
50.0588
7.50.0782
100.1039
Unknown0.0615

We are given with the Absorbance versus the Concentration of Arsenic in parts per billion.

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