Pre-Lab Atomic Emission Spectra PDF

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Pre-Lab 8 Atomic Emission Spectra

Purpose The purpose of this experiment is to analyze the various ways to determine particular substances by observing the light they emit when a large amount of energy is concentrated on them. We will look at the spectra in emission instead of absorption.

Procedure Project Star Spectrometer1. The spectrometer analyzes the spectrum of the overhead fluorescent lights. In the lab notebook we will record the wavelengths that we observe. Alongside each wavelength jot down what we would call the color of that line of light. If there is a noticeable change in the intensity write either strong, medium, or weak next to each wavelength. 2. Examine the spectra of the helium and hydrogen tubes and write down all wavelengths, colors and intensities. Ocean Optics Spectrometer1. If the spectrometer is not set up then point the fiber optic with caution at the gas discharge tube. Even a slight misalignment of the fiber optic might cause the spectrum to record a false reading. 2. Label any peaks from the sources of alternative light so that the radiation is not interfering with the analysis of the gases. 3. Record wavelengths and intensities of the hydrogen and helium gas spectra. 4. After recording hit the Play key once more. Fame Test1. Create a table with all the reagents’ names and a column for observations. 2. Light the Bunsen burner. 3. Take the wooden splint containing the solutions and put it on the floor. Make sure to place the used wooden splint in the beaker filled with water. This experiment will require 8 different salts. 4. Turn off Bunsen burner.

Fun Fact Joseph von Fraunhofer invented the spectroscope in 1814 which could concentrate sunlight into a narrow beam and a prism would diffract the beam into the colors of the rainbow. He observed that the spectrum of the sun was dark where certain colors should have appeared.

Safety Since the sockets in the power supply use a very high voltage it is imperative to keep all hands away from the tubes and sockets at all times. Also, the gas tubes can heat very quickly making them hazardous and fragile. Hydrochloric acid is used in this experiment which is a corrosive substance. Lastly, remember to throw away all chemicals into the correct waste containers....