Am i doing right on this?? Or wrong? (Determining conc of unknown using calibration curve) 9 Merge & Center v$ v % 9Conditional FormFormatting as Ta16fxCFHJKMSample Name IronReplicate 1 Replicate 2Replicate 3 averageabsorbancecocentration(microgramsAiter)12 Blank3 10 ug/L Fe4 100 ug/L Fe5 500 ug/L Fe6 1000 ug/L Fe7 Bud Light8 Juicy Haze9 Landshark Sh to be determined10 Leinenkugel to be determined0.0158.8591307.6801156.8378309.6222895.1578159.3128308.7295158.336566710.0308.6772667894.82916670.289923422.0893.4536100500.01000.0to be determinedto be determined895.87610.7521589082984,9875962.9172931.4392971.7042962.711.272107925925,5586029.9561.57659751.2831422835972.8103333054.9313038.3273023,5913038.949667112.7512113.222113.1685113.0472333-0.146321285226.8524226.6448212.4527226.6448226.7140.155897116213.4358212.1578212.68210.1281497161112131415Chart Title1621718y= 0.0014x + 0.3275R =0,841518191.6201.4211222123240.8250.6260.40.427022829300.0200.0400.0600.0800.01000.01200.0313233343536373839404142 2. In analytical measurements based on emission spectroscopy (such as fluorescencemeasurements 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 aresult, conversion of measured intensities to concentrations relies on the use of calibrationcurves that have to be made and run each time, along with measurement of the actualsamples of interest. Calibration curves are usually run on a daily basis, and sometimes evenmore frequently.In lab, you will be participating in a study we have performed in previous semesters, analyzingbeer. Samples of beer were measured for residual iron contamination. A calibration curve wasmade up using solutions of Fe(NO3)2 that were carefully made to accurate yield-Feconcentrations given in the attached excel spreadsheet. Note that concentrations are given inunits 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 ofeach calibration point and of each sample, you should use the average value of the threemeasurements for each sample. You do not need to be concerned about error analysis orexperimental uncertainty in this particular probtem.

Absorbance and concentration are related as follows: A = ∈cl Because of the linear relationship, the…

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.

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter6: Random Errors In Chemical Analysis

Section: Chapter Questions

Problem 6.16QAP

See similar textbooks

Similar questions

Use the data in Figure 4.8 to estimate the ratio of radiation intensity at 10,000 Å (infrared) to that at 5000 Å (visible) from a blackbody at 5000 K. How will this ratio change with increasing temperature? Explain how this change occurs.
i) Discuss the differences between the AES and XPS in terms of principle and information obtained from the spectra.
Identify and provide either an concise explanation of the concept signal-to-noise ratio (SNR), in the context of chemical analysis.
A spectrophotometer has basic several components. Describe the role of each component and the justification for the setup of an instrument used for excitation spectroscopy and an instrument for emission spectroscopy.
Identify and provide an explanation of the operational principles behind an Atomic Absorption Spectrometer.
Inductively coupled plasma-optical emission spectroscopy (ICP-OES) is a quantitative method for determining trace elements in liquid samples. ICP-OES and other methods of spectrochemical analysis are typically subject to errors due to the present of interferences. It had been reported that ICP-OES is significantly affected by spectral interference, but relatively less affected by the chemical interferences. (i) Explain why ICP-OES is significantly affected by spectral interference but less affected by chemical interferences.
A solution with a known concentration equal to 3.4 mM gave an absorbance reading of 0.820 in a spectrophotometer. Assuming that there isa linear relationship between concentration and absorbance up to a concentration of 4.0 mM, what would the absorbance reading be for asolution with a concentration 1.5 mM?
What issues experienced with fluorescence detectors are resolved using chemiluminescence detectors?
(i) Explain why Beer's Law breaks down when absorbance values are < 0.005. (ii) Explain the operation of a calcium source used in atomic absorbance spectroscopy. (iii) Explain why the calcium source described above will not operate for the quantification of magnesium.
An analyst needs to evaluate the potential effect of an interferent, I, on the quantitative analysis for an analyte, A. She begins by measuring the signal for a sample in which the interferent is absent and the analyte is present with a concentration of 15 ppm, obtaining an average signal of 23.3 (arbitrary units). When analyzing a sample in which the analyte is absent and the interferent is present with a concentration of 25 ppm, she obtains an average signal of 13.7.