Optical Spectroscopy - Test Solution Wavelength (nm) LiCl...

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Optical Spectroscopy Lab Instructor: Dan Mack October 25, 2007
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Results and Discussion: The components of an unknown solution were determined by comparing the observed atomic emission spectra with those observed from solutions containing just one of each compound. The spectra observed after two trials for unknown solution #3 appear in Table 1. Table 1: Unknown Salt Solution (#3) Observed Spectra Trial # Wavelength (nm) 1 589 670 2 589 670 768 Due to similarities, these were compared with the values obtained for solutions of SrCl 2 , KCl and LiCl, which are shown in Table 2. Table 2: Salt Solution Observed Spectra Solution Wavelength (nm) SrCl 2 589 682.6 605 635 646 660 671 LiCl 670 588 KCl 589 768 A guess was made that the solution contained LiCl and SrCl 2 , and flame tests were run to prove it. Table 3 shows this data. Table 3: Observation of Combined Solutions Spectra
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Unformatted text preview: Test Solution Wavelength (nm) LiCl and KCl 670 760 LiCl and SrCl 2 589 670 768 The emission spectra values for hydrogen were also taken, and the values appear in Table 4. Table 4: Emission Spectrum of Hydrogen Element Wavelength (nm) Hydrogen 655 485.3 433.24 The energy associated with each wavelength, E = N A hc l D E = (6.022 10 23 )(6.626 10- 34 )(3.00 10 8 ) 655 10- 9 D E = 183 kJ/mol E = 246.7 kJ/mol E = 276.30 kJ/mol was then used to construct a partial energy level diagram for hydrogen. Conclusion: Due to the similarities between the observed spectra of the unknown solution in Table 1 and the LiCl/SrCl 2 solution in Table 3, the unknown was determined to be a solution of lithium chloride and strontium chloride. A partial energy level diagram was drawn for hydrogen:...
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This lab report was uploaded on 02/14/2008 for the course CHEM 2070 taught by Professor Chirik,p during the Fall '05 term at Cornell University (Engineering School).

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Optical Spectroscopy - Test Solution Wavelength (nm) LiCl...

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