Transfer the solutions into small vials. The volumes in the vials should be very nearly equal. Then place the vials (containing the solutions) on a white piece of paper next to each other. Look very carefully at the intensity of the colour of each solution. Arrange the solutions S, 1, 2, 3 and 4 in order of decreasing intensity of the colour: Is there any relationship between the concentration of each solution and the intensity of the colour of the solution? Explain.

Transfer the solutions into small vials. The volumes in the vials should be very nearly equal. Then place the vials (containing the solutions) on a white piece of paper next to each other. Look very carefully at the intensity of the colour of each solution. Arrange the solutions S, 1, 2, 3 and 4 in order of decreasing intensity of the colour: Is there any relationship between the concentration of each solution and the intensity of the colour of the solution? Explain.

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter20: Molecular Spectroscopy And Photochemistry

Section: Chapter Questions

Problem 50P

See similar textbooks

Similar questions

1. Describe the mechanisms of fluorescence and phosphorescence (include a sketch showing the different transitions). 2. How could you test the proposed mechanisms?
How do solvent, temperature, and pH affect fluorescence of fluorophore?
When light passes through a colored solution placed in a 1 cm thick cell, the ratio of the incident light to the transmitted light is 1.26 km. This is equivalent to this ratio for the same solution when placed in a 2 cm thick cell.
The alkali and few alkaline earth metals impart colour to a flame, a property used in the flame test experiment, however, Be and Mg do not impart colour to flame. Give reason?
Estimate the Ka of a weak acid from the data given below. One gram quantities of the acid were dissolved in equal quantities of the various buffer solutions and all solutions were measured under the same conditions. The anion of the acid is the only species that absorbs at the wavelength used. pH: Abs: 4 0.0 5 0.0 6 0.06 7 0.39 8 0.95 9 1.13 10 11 1.18 1.18
Determine molar concentration of the colored solution in a 1.00 cm cell which transmits 40.0% of the incident light that passed through it, if ε = 4.52 x 10³ Lmol-¹cm-¹ 4.91 x 10-5 M 1.33 x 10-4 M 8.81 x 10-5 M 8.83 x 10-5 M
In optical analysis, what are the methods used to calculate the concentration ofa solution from the absorbance measurements of colorimeters?
The selenium content in soil can be determined fluorometrically upon conversion of the selenium to the fluorescent product shown, followed by extraction in cyclohexane. Emission from the fluorescent product is observed at 518 nm. The selenium content in a 0.168 g soil sample was converted to the fluorescent product and extracted in 50.0 mL of cyclohexane. The method of standard additions was used to determine the selenium content in the soil sample. Initially, 3.00 mL of the cyclohexane solution were placed in a cuvette for fluorescence determination. Several small additions of a 2.49 µg Se/mL standard solution containing the fluorescent product were added to the 3.00 ml. solution in the cuvette. The fluorescence was measured at 518 nm. The results are shown in the table. Total added Se standard volume (µL) 0.00 20.0 40.0 60.0 80.0 Se wt% Determine the weight percent (wt%) of selenium in the soil sample and find the absolute uncertainty in the weight percent of selenium. Report the…
The selenium content in soil can be determined fluorometrically upon conversion of the selenium to the fluorescent product shown, followed by extraction in cyclohexane. Emission from the fluorescent product is observed at 518 nm. The selenium content in a 0.168 g soil sample was converted to the fluorescent product and extracted in 50.0 mL of cyclohexane. The method of standard additions was used to determine the selenium content in the soil sample. Initially, 3.00 mL of the cyclohexane solution were placed in a cuvette for fluorescence determination. Several small additions of a 2.49 µg Se/mL standard solution containing the fluorescent product were added to the 3.00 ml. solution in the cuvette. The fluorescence was measured at 518 nm. The results are shown in the table. Total added Se standard volume (µL) 0.00 20.0 40.0 60.0 80.0 Se wt% Determine the weight percent (wt%) of selenium in the soil sample and find the absolute uncertainty in the weight percent of selenium. Report the…
Many chemistry problems result in equations of the form 1.44 × 10¬2 (0.298 – x) When this equation is solved, the two values of the unknown x are and Submit Answer Retry Entire Group No more group attempts remain
6. Blue Blue dye stock solution 0.293 M Absorbance at 630 nm 0.00265 Calibration curve y = 0.0833x A solution is prepared by diluting 2.79 mL of the blue dye stock solution to 25.00 mL. The measured absorbance for the prepared solution is listed in the data table. (a) What is the theoretical molar concentration? [Blue]theoretical x 10 |M (b) What is the experimental molar concentration? [Blue]experimental x 10 M (c) What is the percent error? Percent error (blue) = %
Kiko wants to determine the concentration of an unknown solution which produces a green solution. However, the spectrophotometer he uses doesn't have a function to determine the analytical wavelength of the solution. What is the most probable analytical wavelength he can use for the experiment? Refer to the color wheel below.