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Essay on spectrophotometery | ||
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This is the first 1,000 characters of 1213 words (4.85 pages) in the essay titled spectrophotometery The purpose of this lab experiment is to understand the uses of spectrophotometry. This experiment concentrates on the uses of the spectrophotometer, and using this instrument to specifically determine the absorption spectrum of a cobalt chloride solution, a galactose solution, and to determine an unknown concentration of a galactose solution.Modern biologists frequently use the measurement of light absorption to determine concentration of chemicals. The technique is called spectrophotometry. However, why is light absorbed? Light may be simply scattered by particles, but this is extremely important to the measurement of truly absorbed light. Light is the part of electromagnetic radiation to which the human eye is sensitive. Light is energy, and when absorbed by a chemical it results in a change in energy levels of the chemical. The energy of light depends on its wavelengths. Longer wavelengths, such as infrared, have less energy than shorter wavelengths, such as ultraviolet. A molecule will absorb light energy when a wavelength exactly matches the energy difference between two energy states of the molecule. A spectrophotometer makes use of the transmission of light through a specific solution to determine the concentration of a solute within a solution. It is based on a simple design of passing light of a known wavelength through a sample and measuring the amount of light energy that is transmitted. The design of a single beam spectrophotometer involves a lig... |
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Keywords: voltage fluctuation, wavelengths, concentration, spectrophotometer, absorption spectrum, light absorption, electromagnetic radiation, light energy, galactose, spectrophotometry, wavelength, molecule, measurement, energy difference, energy states, two energy, lab experiment, cobalt chloride, readable data, specific solution