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lab4 - John Abbott College Department of Chemistry...

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John Abbott College Department of Chemistry Chemistry NYA Lab 4 Week of February 6 th , 2006 Emission Spectra Objectives: 1. To measure the wavelength of the emission lines in the visible region of the hydrogen spectrum. 2. To determine the value of the Rydberg constant, R H . 3. To identify a cation in solution. Theory: Visible light is frequently emitted when an excited electron relaxes, or ‘falls’ to a lower energy level. The original source of excitation for the electrons could be a high-voltage electrical discharge, as in a discharge tube, or the heat from a Bunsen burner flame. In the specific case of the hydrogen line spectrum, the loss of energy of the electron (J E ) obeys the following equation, where R H is the Rybdberg constant and n initial and n final are positive integers, the electron’s initial and final energy levels, respectively: Chemicals: Solutions of known cations Hydrochloric acid Solution of an unidentified cation, one from the previously-observed cations Glassware and Equipment:
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