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Frankie determined the trendline for their Calibration Curve for the relationship between Absorbance and [FeSCN2+] was
y = 3823.3 x − 0.0127
During Part B, Frankie measured the absorbance of Equilibrium Solution 3 as 0.292 a.u. (absorbance units).
Question 1: What is the equilibrium concentration of the [FeSCN2+]?
Anjelica used the absorbance of 0.449 a.u. to determine the equilibrium concentration of [FeSCN2+] for Run 5 was 1.17 x 10-4 M. Previously, Anjelica calculated the initial concentrations of [Fe3+] = 1.00 x 10-3 M and [SCN-] = 1.00 x 10-3 M.
Question 2: What are the equilibrium concentrations of [Fe3+] and [SCN-]?
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- The standard curve was made by spectrophotographic analysis of equilibrated iron(III) thiocyanate solutions of known concentration. You are asked to analyze a Fe(SCN)2+Fe(SCN)2+ solution with an unknown concentration and an absorbance value of 0.4150.415 . The slope-intercept form of the equation of the line is ?=4558.4?+0.0147y=4558.4x+0.0147 . The unknown was analyzed on the same instrument as the standard curve solutions at the same temperature. What is the Fe3+Fe3+ concentration of the unknown solution?In an experiment on UV-Vis Spectrophotometry, What are the results for A and B? A. Calibration Curve Concentration of Cu2+ solution Absorbance Molarity (M) ppm Cu 0.010 .0965 0.020 0.199 0.030 0.3235 0.040 0.4385 0.050 0.5543 0.060 0.6652 0.070 0.7239 0.080 0.8463 0.090 1.0354 0.100 1.3572 B. Unknown Analysis Trial Absorbance ppm Cu 1 0.4681 2 0.5074 3 0.4297 Average ppm Cu in sample Standard Deviation % Relative Standard DeviationA method for the analysis of Ca2+ in water suffers from an interference in the presence of Zn2+. When the concentration of Ca2+ is 100 times greater than that of Zn2+, an analysis for Ca2+ gives a relative error of +0.5%. What is the selectivity coefficient for this method?
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- Sally obtains a standard calibration curve for their assigned food dye by plotting absorbance versus concentration (in M) of known solutions and finds the following slope and intercept: y = 1.585x + 0.041 Sally finds that her original Kool-aid sample is too concentrated, so they dilute it by transferring 4.00 mL of the original Kool-aid sample into a new container and diluting to a total volume of 27.00 mL. If the absorbance of the dilute Kool-aid sample at the appropriate wavelength for their assigned dye is 0.931, determine the concentration (in M) of the assigned food dye in the original Kool-aid sample. Report your answer with three places after the decimal.Maria was tasked to determine the concentration of a Fe2(SO4)3 solution. She prepared 5 different standards of Fe2(SO4)3 using the table below as her guide. She ran the standards and the unknown solution through UV-VIS spectroscopy and recorded the absorbances of each solution. What is the slope of the line of the standard curve from the given data? 0.3194 1.1385 0.3217 2.131The following results were obtained when each of a series of standard silver solutions was analyzed by flame atomic spectrometry. Concentration, ng ml1 5 10 15 20 25 30 Absorbance 0.003 0.127 0.251 0.390 0.498 0.625 0.763 1. Using a graphing paper, plot the calibration curve