the absorbance of an equilibrium mixture of Fescn2+ was measured at 447nm and found to be 0.319. What is the equilibrium concentration of FeSCN2+
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the absorbance of an equilibrium mixture of Fescn2+ was measured at 447nm and found to be 0.319. What is the equilibrium concentration of FeSCN2+?
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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?The concentration of Fe2+ in a sample is determined by measuring the absorbance of its complex with ferroxine. The sample, measured in a 1.00 cm cuvette, has an absorbance of 0.254. The reagent blank in the same cuvette has an absorbance of 0.015. What would be the absorbance reading for each of these two solutions if measured in a 7.00 cm cuvette? Asample = Areagent blank =The complex formed between Cu(I) and 1,10- phenanthroline has a molar absorptivity of 7000 L cm-1 mol-1 at 435 nm, the wavelength of maximum absorption. What is the the absorbance of a 6.17 x 10-5 M solution of the complex when measured in a 1.00-cm cell at 435 nm.
- A series of standard iron-phenanthroline [Fe(phen)3]2+ complex ion solutions were prepared. The absorbance of each solution was measured at a wavelength of 510 mm. A calibration curve of absorbance vs. concentration was then plotted to obtain a linear equation of y = 0.0018x+0.0749. The absorbance of an unknown [Felphenly solution was measured to be 0.326. Calculate the concentration of the complex ion. NOTE! Report your answer as a WHOLE #. Type your answer...A mixture is prepared by combining 11.34 mL of 2.36 x 103 M Fe(NO3)3 with 10.00 mL of 1.66 x 10-3 M KSCN. The solution turns red due to the formation of FeSCN2+. The absorbance is measured and, using a calibration plot, the [FESCN2*] at equilibrium is found to be 2.20 x 10-4 M. Complete the following ICE table Fe3+ SCN 1t FESCN2+ initial (M) (A) (B) (C)0 change (M) (D) (E) (F) equilibrium (M) (G) (H) (1) What is the value of K?A standard solution was put through appropriate dilu tions to give the concentrations of iron shown in the ac companying table. The iron(II)-1,10,phenanthroline complex was then formed in 25.0-ml aliquots of these solutions, following which each was diluted to 50.0 mL (see color plate 15). The absorbances in the table (1.00-cm cells) were recorded at 510 nm Fe(II) Concentration in Original Solution, ppm Aşie 4.00 0.160 0.390 10.0 16.0 0.630 24.0 0.950 32.0 1.260 40.0 1.580 (a) Plot a calibration curve from these data. (b) Use the method of least squares to find an equa tion relatin g absorbance and the concentration of iron(II). (c) Calculate the standard deviation of the slope and intercept.
- at 580 nm, which is the wavelength of its maximum absorption the complex Fe(SCN)2+ has a molar absoptivity of 7.00x10^3 L cm-1 mol-1. Determine the absorbance of a 3.50 x10^-5 M solution of the complex at 580 nm in a 1 cm cell Express in 3SFThe sodiuṁ salt of 2-quinizarinsulfonic acid (NaQ) forms a complex with Al3+ that absorbs strongly at 560 nm. From the data of the absorbance, find formula of the complex. In all solutions, [A3+]=3.7x105 M and the cell length is 1.00 cm. (Apply the molar-ratio method.) ca/M A(560) mol ratio [Al3+]/[Q] 1,00E-05 0,131 2,00E-05 0,265 3,00E-05 0,396 4,00E-05 0,468 5,00E-05 0,487 6,00E-05 0,498 8,00E-05 0,499 1,00E-04 0,5 OH NaQAt 580 nm, the wavelength of its maximum absorption, the complex Fe(SCN)2+ has a molar absorptivity of 7.00 X 103 L mol-1 cm-1. Calculate (a) the absorbance of a 2.50 X 10-5 M solution of the complex at 580 nm in a 1.00-cm cell. (b) the absorbance of the solution in which the concentration of the complex is twice that in part (a) (c) the transmittance of the solutions described in parts (a) and (b) (d) the absorbance of a solution that has half the transmittance of that described in part (a) answer letter d please
- At 580 nm, the wavelength of its maximum absorption, the complex Fe(SCN)2+ has a molar absorptivity of 7.00 X 103 L mol-1 cm-1. Calculate (a) the absorbance of a 2.50 X 10-5 M solution of the complex at 580 nm in a 1.00-cm cell. (b) the absorbance of the solution in which the concentration of the complex is twice that in part (a) (c) the transmittance of the solutions described in parts (a) and (b) (d) the absorbance of a solution that has half the transmittance of that described in part (a)A solution containing the complex formed between Bi(III) and thiourea has a molar absorptivity of 9.32 x 103 M-1 cm-1 at 470 nm. (a) Calculate the absorption of a 4.25x10-5 M solution of the complex at 470 nm in a 1-cm cell. (b) What is the molar concentration of the complex in a solution that has the calculated absorption in (a) when measured at 470 nm in a 2.50 cm cell?The molar absorptivity (ε) of the FeSCN2+ complex ion is 4700 M-1 · cm-1 at a wavelength of 450 nm. Using a 1-cm sample tube, you measure the absorbance as (2.0x10-1). What is the concentration of FeSCN2+?