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A: To define: Relationship between the intensity of light transmitted and absorbance of the light.
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- a solution has a %T value of 51.6% at 550 nm. What us the absorbance of this solution at this wavelenght?A solution with %T = 75.9% has an absorbance equal to: A = log (1 T) T= (% T 100)Based on the plot, what [Fe(SCN)2+] would the student report for a solution that has an absorbance of 0.540 at 510 nm? [Fe(SCN)2+] =
- A standard curve of absorbance vs. concentration has a linear trendline of y = 0.56x + 0.987. Use this trendline to calculate the concentration of an unknown sample that has an absorbance of 1.245.A student prepared four standard solutions of (NH4)2Fe(SO4)2 and measured their absorbance at 505 nm. She created a calibration plot with the best-fit line of y = 9372 x + 0.0539. She measured the absorbance of her diluted unknown sample solution as (4.69x10^-1) nm. If she prepared her diluted sample solution by diluting 10.00 mL of the original solution to a total volume of 50.00 mL with deionized water, what is the concentration of Fe2+ in her original solution? Answer in units of M. Note: Your answer is assumed to be reduced to the highest power possible.Suppose that absorbances of several solutions were measured at 520nm. What is the frequency of this wavelength? What is the energy of this wavelength? h = 6.626 x 10^-34 J • s)
- Amines, RNH2, react with picric acid to form amine picrate which absorbs strongly at 328 nm (ε = 17.15 L/mol.cm). A mass of 0.1825 g of the amine is dissolved in water and diluted to 100 mL. If this solution exhibits an absorbance of 0.336 at 328 nm using a 1.00 cm cell, what is the molar mass of the amine?If a solution has an absorbance value of 0.325 at a wavelength of 450 nm, what is the percent transmittance of this solution at this wavelength?A researcher finds that a sample of an unknown solution, when placed in a 1.00 cm wide cuvette, absorbs approximately 70.0% of incident light. What is the absorbance of the solution?
- Why it is important to measure the absorbance in the range of 0.4 to 0.9.The drug Tolbutamine (molar mass = 270) has a molar absorptivity of 703 at 262 nm.One tablet is dissolved in water and diluted to a volume of 2L. If the resulting solution(taken in a cell of 1 cm) exhibits an absorbance equal to 0.687 at 262 nm, how manygrams Tolbutamine are contained in the tablet?A plot of Absorbance vs. molarity of Fe(SCN)2+ from part one of the lab gives a straight line with the following equation. y = 51x R2 = 0.998 If a student measures an absorbance value of 0.375 in the second part of the lab, what is the molarity of Fe(SCN)2+ in this solution?