Lab Report #6

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Midland College *

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1111

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Chemistry

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Dec 6, 2023

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docx

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8

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General Chemistry Lab I CHEM 1111.001 Experiment #3: Shedding Light on the Structure of the Atom Student’s name: Retha (Kaleigh) LaForge Lab partner(s) name: Richard Ramirez Date: 23 October 2023
Objectives/Goals : learn to use a basic spectroscope to observe the emission lines of a series of elements. You will also use your knowledge about the properties of light to calculate the energy and frequency associated with major transitions in an element. Safety Concerns: Some light sources (e.g. hydrogen and nitrogen lamps) may emit ultraviolet radiation, which can damage your eyes. The typical safety glasses will protect your eyes from the UV radiation, so keep your safety glasses on at all times. Follow all laboratory rules accordingly. Procedure/Methodology: Generation of calibration curve. Pointed the slit of the spectroscope toward the fluorescent light while looking through the diffraction grating. Recorded the color and its position on numbered grid. Used the given information and generated a regression line for use as a calibration curve as well as the calibration equation. Calculated the energy associated with the emission line of a sodium sample appearing at 5.9 in the grid line. Used calibration curve data to determine the wavelength of this sodium line. The literature value for the wavelength associated with the sodium line is 589 nm. Calculated the percentage error associated with the wavelength calculated. Converted the wavelength from the sodium emission line to the energy associated with this transition. Identified each sample by recording the line spectrum, using the calibration equation to convert each grid position to a wavelength, recorded the wavelengths on graph, and compared the line spectrum recorded to the set of known line spectra to identify each substance. Then using this information, created a scatter plot to represent the change in wavelengths for each grid position of each substance.
Observations/Data: Calibration Data for the Spectroscope Color Wavelength (nm) Grid Position Violet 404.7 4.5 Blue 435.8 5.0 Green 546.1 5.6 Yellow 578.1 6.0 Red 690.7 6.3 y = 0.0062 x + 2.2039 R 2 = 0.9383 ? = 0.0062 ? = 2.2039 ? = Grid Position values *Used excel software to calculate equation Analysis of Sodium Known Grid Position: 5.9
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