Lab_2_Report - Water Clarity Introduction: The purpose of...

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Water Clarity Introduction: The purpose of this lab is to observe the effects of water clarity and depth on light attenuation. Since water scatters light, not all light can always reach the bottom of a body of water. The more particles present in a body of water, the more matter there is for light to reflect off of, thus deterring the light from reaching greater depths. Naturally the deeper the depth, the more distance light has to travel, and thus more matter to attenuate it, and vice versa. As in any body of water, the more particles dissolved in the solvent, the darker and murkier the water looks. However in bodies of water with less solute dissolved in them, the water is clearer, and allows one to see to a greater depth. This prior knowledge has led me to believe that the greater the concentration of particles, or the less clear the water is, the greater the attenuation coefficient will be. Methods: Carefully calculate the amounts of Nestea and Diatom particles needed to attain the designated stock concentration of 1 g/l of Nestea and .1 g/l of diatom particles. To reach every desired concentration thereafter use the formula Va=CD/CS * Vt, solving for Va, or the volume added, with CD being the concentration desired, CS is equal to the stock concentration, and Vt being the total volume. Pour the solution into the tube situated over the photometer, place the light source on top of the tube for 3-4 seconds, after you have received a reading, turn of the light. This is done for both 500 ml and 50 ml quantities of both solutions, at each concentration.
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Lab_2_Report - Water Clarity Introduction: The purpose of...

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