Suppose you measure the absorbance of a yellow dye solution in a 1.00 cm cuvette (b31.00 cm). The absorbance of the solution at 427 nm is 0.29. If the molar absorptivity of yellow dye at 427 nm is 27400 M-cm-1, what is the concentration of the solution in M?

A student makes a Beer's Law plot of A vs [Fe(SCN)2+] in the first part of the equilibrium constant lab, and gets the following information from the trendline. y = 50.7x R² = 0.9999 If the student measures a absorbance of 0.167 for a solution in the second part of the lab, what equilibrium concentration of [Fe(SCN)²+ would be reported?

The concentration of a dilute aspirin solution is 0.000530 M 0.000530  M  . Standard solutions of this compound were used to prepare a Beer's law plot which gives a slope of 1550.1  M −1 1550.1  M − 1  . What is the expected absorbance value for the aspirin solution?

Suppose that a solution has an absorbance of 0.250 at a wavelength of 450 nm.  If the concentration of the solution is 22 μM, what is the value of the molar absorptivity?  The data were taken with a standard 1-cm cuvette. molar absorptivity in (L cm^−1 mol^-1):

(5) A sample of sodium phosphate is dissolved in water to give 100.00 mL of solution (Solution A). Then this solution is diluted 5 times to give the final solution (Solution B). Solution B is Known to contain 3.920 x 1022 number of PO43- ions, which has an absorption peak at 460 nm and absorbance value of 0.355 in a 1.000 cm cuvette. (i) Calculate the molar absorptivity of Solution B. (ii) What mass of sodium phosphate (MM 163.94 g/mol) dissolved in Solution A.

Q7) what is the pH at the equivatent point in the titration of 5 mmol Potassium acid ph thalate dissolved in 100 mel of water and titrat ed with 0.1M NaoH 9 K, = 4 +r56 %3D Ans. : 8.46

A student measures k for a certain blue dye to be 600.4 M-¹ at 560 nm. What is the molarity of the dye in a solution with an absorbance of 0.204 at this wavelength? Ens nousior #inslo: Monia sin 8 foi 00.01 Par det id elsem. sow & netimuloa 51 (5) sonos silf et trawIm 00 001 et gauzulib im

The un-ionized form of the weak acid HA does not absorb in the visible region. When it ionizes, its conjugate base (A-) absorbs light strongly at 510 nm. The following data were obtained by measuring the absorbance at 510 nm of solutions with a concen- tration of 1.0 x 104 M HA in different pH buffers. pH Absorbance 2.0 0.00 3.0 0.00 4.0 0.00 5.0 0.025 6.0 0.180 7.0 0.480 8.0 0.570 9.0 0.595 10.0 0.595 11.0 0.595 12.0 0.595 What is the approximate pK of HA?

What is the absorbance of a theoretical compound in a 5.26x10-5 M solution, a path length of 1.5cm, and a molar absorptivity of 37.4 mol / L cm?

Consider the spectrum of (Co(H20)6]** in aqueous solution below and answer the questions that follow: 0.14 0.12 0.1 0.08 0.06 0.04 0.02 Wavenumber em A = 18,000 cm B = 27,000 cm (a) Use the appropriate Tanabe-Sugano diagram to assign the absorbance bands in the spectrum above. (b) Which transition is not observed in the spectrum? Suggest a reason why only two absorption bands are observed. (c) Determine the B Racah parameter. Show all calculations. (d) Determine the Ao parameter. Show all calculations. Absorbance