Optical Spectroscopy - Optical Spectroscopy by Megan...

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Optical Spectroscopy by Megan Lawless Lab Instructor: Mr. Hoch October 26, 2007
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Results and Discussion: The purpose of this lab was to observe various emission spectra and use this information to determine the identity of an unknown salt solution. The observed emitted wavelengths for various sources are shown in Table 1. Table 1. Emission spectra for various sources. Source Observed Wavelengths (nm) Fluorescent light 430, 480, 535, 600 Incandescent light bulb Continuous (all wavelengths) Helium 441, 500, 581, 661 Sodium chloride 450, 475, 520, 570, 600 Lithium chloride 580, 660 Potassium chloride 600 Calcium chloride 500, 550 Strontium chloride 520, 590, 610 Calcium choride and potassium chloride 580, 600, 620 The unknown salt solution number 3 was found to emit wavelengths of 440, 510, 600, 610, 620, and 670. Using the information in Table 1 as a comparison, the unknown solution was found to be a mixture of sodium chloride and strontium chloride.
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Unformatted text preview: The emission spectrum of hydrogen was also observed. From the wavelengths observed, an energy diagram was created representing the energy amounts that can be emitted by a hydrogen atom. The energy was determined using the following formula: E=hν=hcN A λ Wavelengths of 430, 480, and 660 were observed, which correspond to photons with energies 278, 249, and 181 kJ/mol. Conclusion: The identity of the unknown salt solution could be determined by combining known emission spectra and comparing it to the solution’s spectra. After comparing several emission spectra, the unknown salt solution (number 3) was determined to be a mixture of sodium chloride and strontium chloride. The energy level diagram for hydrogen could be constructed by recording wavelengths observed in the emission spectra and plugging them into the equation for the energy of each photon....
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