A flask contains 0.25 mole of SO2(g), 0.50 mole of CH4(g), and 0.50 mole of O2(g). The total pressure of the gases in the flask
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Bromocresol purple displays a color transition from yellow in its acidic form to purple in its basic form:
Bromocresol purple:
HIn + H₂O ⇄ In⁻ + H₃O⁺
yellow Purple
Upon completing the experiment, you should generate a graph resembling the one found in the practice guide. Refer to the accompanying image:
To identify the wavelength of peak absorbance for the pH < 4.0 solution, you should look at the curve plotted for pH 4. This curve exhibits a peak near 450 nm (inspect your graph closely). At this point, the solution appears yellow.
In order to determine the wavelength of maximum absorbance for the pH > 10.0 solution, focus on the line corresponding to pH 10. The apex of the curve should be around 590 nm, with the color at this wavelength being purple.
Regarding the last question: How do the observed colors of these solutions relate to the colors at their absorbance maxima? The colors we see are complementary to the colors at the wavelengths where absorption occurs. Specifically, 590 nm corresponds to red light. As red is absorbed, the color that is visible to us is its complement. The same principle applies to yellow, which is the complementary color of the absorbed wavelength.
Bromocresol purple:
HIn + H₂O ⇄ In⁻ + H₃O⁺
yellow Purple
Upon completing the experiment, you should generate a graph resembling the one found in the practice guide. Refer to the accompanying image:
To identify the wavelength of peak absorbance for the pH < 4.0 solution, you should look at the curve plotted for pH 4. This curve exhibits a peak near 450 nm (inspect your graph closely). At this point, the solution appears yellow.
In order to determine the wavelength of maximum absorbance for the pH > 10.0 solution, focus on the line corresponding to pH 10. The apex of the curve should be around 590 nm, with the color at this wavelength being purple.
Regarding the last question: How do the observed colors of these solutions relate to the colors at their absorbance maxima? The colors we see are complementary to the colors at the wavelengths where absorption occurs. Specifically, 590 nm corresponds to red light. As red is absorbed, the color that is visible to us is its complement. The same principle applies to yellow, which is the complementary color of the absorbed wavelength.