2. In the determination of copper in steel using flame atomic absorption spectrophotometry, the following table shows the results for the standard copper solutions. Concentration (ppm) 1.0 Absorbance 2.0 3.0 4.0 5.0 6.0 0.118 0.226 0.338 0.422 0.492 0.562 First plot the calibration curve assuming the data are linear. Then plot the residual graph which is the exact deviation of the original data from the data on the line against the concentration of copper. Comment on the results. (20%)

2. In the determination of copper in steel using flame atomic absorption spectrophotometry, the following table shows the results for the standard copper solutions. Concentration (ppm) 1.0 Absorbance 2.0 3.0 4.0 5.0 6.0 0.118 0.226 0.338 0.422 0.492 0.562 First plot the calibration curve assuming the data are linear. Then plot the residual graph which is the exact deviation of the original data from the data on the line against the concentration of copper. Comment on the results. (20%)

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

Similar questions

The results obtained by two analysts for the lead content of samples obtained at different certified points in Rustenburg are as follows: Analyst 1 – 79.22, 79.41,79.66, 79.45 Analyst 2 – 79.09, 79.08, 79.25, 79.13, 79.10, 79.19 Using the equation, calculate the following 1.the standard deviations 2 .the mean values of the two sets of data and 3. s-pooled
Give answer a,b,c with explanation please
Test Tube Number Cobalt Chloride Concentration (mol/mL) Absorbance at 510 nm 1 0.000 0.000 2 0.009 0.042 3 0.018 0.92 4 0.027 0.139 5 6 0.036 0.045 0.190 0.236 7 (Unknown) 0.151 1. what is the concentration of unknown cobalt chloride solution? 2. why is the absorbance at the absorption peak ?
Give answer all questions with explanation please
You are developing a procedure for determining traces of copper in biological materials using a wet digestion followed by measurements by atomic absorption spectrophotometry. In order to test the validity of the method, you obtain a NIST orchard leaves standard reference material and analyze this material with your procedure five times and obtain a mean of 12.27 ppm with a standard deviation of 0.097 ppm. The NIST sample is listed as 11.7 ppm. Does your method give a statistically valid value at the 95% confidence level?
How much iron ore (that assays at 10.18% Fe) must be used in an analytical procedure that is known to have a low bias of −0.15 g if an overall relative error of 0.48 ppth in the iron content is desired?
Calculate the sample standard deviation, s, for this set of data: 4.5, 6.7, 4.2, 9.6, 3.4, 8.2 Report your answer to the fourth decimal place.
Calculate the sample standard deviation, s, for this set of data: 1.9, 1.5, 6.0, 2.0, 1.4, 1.2 Report your answer to the fourth decimal place.
Ksp= 2.3x10^-13
How much iron ore (that assays at 16.54%16.54% Fe)Fe) must be used in an analytical procedure that is known to have a low bias of −0.15 g if an overall relative error of 2.26 ppth in the iron content is desired?
Francis A. Santos A chemist obtained the following data for the percent compound Z in triplicates (n=3) of an insecticide preparation: 7.47, 6.98, and 7.27. Calculate the 90% confidence limit for the mean of the data assuming that only information about the precision of the method is the precision for the three data points. A 7.24 + 0.74% B) 7.24 + 0.27% 7.24 + 0.13% 7.24 + 0.42%