Consider the following hypothetical scenarios and propose how theymay impact(a) the components of a calibration curve (axis values, slope, R-squared value, y-intercept and(b) the precision and accuracy of your calculated unknownconcentration.Scenario 1: Your pod took replicate measurements that had large standarddeviations.Scenario 2: The cuvette you used was improperly cleaned, and there wasalready trace amounts of copper sulfate solution in the cuvette. All othertechniques were done properly.Scenario 3: Your pod did not read the meniscus at eye level, insteadchoosing to read it while standing up and looking down at the volumetricflask

Consider the following hypothetical scenarios and propose how theymay impact(a) the components of a calibration curve (axis values, slope, R-squared value, y-intercept and(b) the precision and accuracy of your calculated unknownconcentration.Scenario 1: Your pod took replicate measurements that had large standarddeviations.Scenario 2: The cuvette you used was improperly cleaned, and there wasalready trace amounts of copper sulfate solution in the cuvette. All othertechniques were done properly.Scenario 3: Your pod did not read the meniscus at eye level, insteadchoosing to read it while standing up and looking down at the volumetricflask

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter11: Atomic Mass Spectrometry

Section: Chapter Questions

Problem 11.10QAP

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49 measurements of a variable have been made, resulting in a mean of 9.491 and a population standard deviation, σ, of 1.212. Indicate whether any of the following values can be rejected using the 2sm criterion: 9.357; 9.399; 9.577; 9.605?(A). Yes, 9.357 and 9.605 can be rejected(B). Yes, 9.357 can be rejected(C). Yes, 9.605 can be rejected(D). No, none should be rejected
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Directions: (1) Determine the total volume of the standards by using a formula in the appropriate boxes (your instructor will help you with this). (2) Determine the concentration of Cu2+ in each standard, also using a formula in the appropriate cells. (3) Plot the absorbance as a function of Cu2+ concentration. Determine the equation for the best-fit line. 1.0 M ethylenediamine (mL) concentration Cu2+ absorbance (AU) at 550 nm 0.01 M CuSO4 5H2O H2O total volume stock Cu2+ standard (mL) (mL) (mL) (units) concentration (M) 1 0.50 0.00 9.50 0.025 0.01 2 0.50 0.50 9.00 0.031 0.01 3 0.50 1.00 8.50 0.048 0.01 4 0.50 2.00 7.50 0.153 0.01 5 0.50 3.00 6.50 0.223 0.01 0.50 4.00 5.50 0.307 0.01 7 0.50 5.00 4.50 0.384 0.01
A 5.00 (+0.01) mL Class A transfer pipet is used to transfer 5.00 mL of a 0.259 (+0.003) M Cu²+ stock solution to a 100.00 (+0.08) Class A volumetric flask. Deionized water is used to bring the flask to volume. Calculate the concentration of the diluted soluion in the volumetric flask and report its absolute uncertainty. Significant figures are graded for this problem. To avoid rounding errors, do not round your answers until the very end of your calculations. [Cu²+] = M H M