of students made 5 standard solutions and measured their corresponding absorbance values at group a wavelength of 525.0 nm to generate the graph below. Absorbance of Standard Solutions to Find Concentration of Unknown X Solution 0.50 y = 75.9x + 0.0045 R? = 0.9946 0.40 0.30 0.20 0.10 0.00 0.001 0.002 0.003 0.004 0.005 0.006 Concentration of X (mole/L) The colorless reactants V and W form unknown X from the reaction: 2V + W S X A solution is prepared by mixing together the following: Volume 0.0150 M V (mL) Volume 0.0150 M W (mL) 6.00 4.00 This solution reaches equilibrium, and then is placed in a 1.00 cm wide cuvet and inserted into the spectrometer, producing an absorbance reading of 0.275 at a wavelength of 525.0 nm. Calculate Keg for the above reaction, including units. Absorbance

of students made 5 standard solutions and measured their corresponding absorbance values at group a wavelength of 525.0 nm to generate the graph below. Absorbance of Standard Solutions to Find Concentration of Unknown X Solution 0.50 y = 75.9x + 0.0045 R? = 0.9946 0.40 0.30 0.20 0.10 0.00 0.001 0.002 0.003 0.004 0.005 0.006 Concentration of X (mole/L) The colorless reactants V and W form unknown X from the reaction: 2V + W S X A solution is prepared by mixing together the following: Volume 0.0150 M V (mL) Volume 0.0150 M W (mL) 6.00 4.00 This solution reaches equilibrium, and then is placed in a 1.00 cm wide cuvet and inserted into the spectrometer, producing an absorbance reading of 0.275 at a wavelength of 525.0 nm. Calculate Keg for the above reaction, including units. Absorbance

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter12: Spectrochemical Methods

Section: Chapter Questions

Problem 10P

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A student prepared several solutions of an unknown molecule, each at a different concentration. The absorbance of each solution was measured at 630 nm with a path length of 0.760 cm. The student then plotted the absorbance of each sample vs. its concentration (in uM), and found a best-fit line of y = 0.00626x + 0.00732. Calculate the molar absorptivity of the unknown molecule (in M-1 cm-1).
Five standard chromium (VI) solutions were prepared through serial dilution technique with corresponding absorbance readings at 540 nm wavelength (as follows: Absorbance Concentration A1 = 0.650 C1 = 1.9 ppm A2 = 0.712 C2 = 4.0 ppm A3 = 1.370 C3 = 6.0 ppm A4 = 2.050 C4 = 8.0 ppm A5 = 3.423 C5 = 10.0 ppm The sample solution gives an average absorbance reading of 0.713. What is then the concentration of chromium (VI) ion in the sample?
Five standard chromium (VI) solutions were prepared through serial dilution technique with corresponding absorbance readings at 540 nm wavelength as follows: Absorbance Concentration A1 = 0.650 C1 = 1.9 ppm A2 = 0.712 C2 = 4.0 ppm A3 = 1.370 C3 = 6.0 ppm A4 = 2.050 C4 = 8.0 ppm A5 = 3.423 C5 = 10.0 ppm The sample solution gives an average absorbance reading of 0.713. What is then the concentration of chromium (VI) ion in the sample? (Note: please provide necessary solutions)
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