Determination of Chlorine 2

Determination of Chlorine 2 - Determination of Chlorine...

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Purpose: The purpose of this lab is to determine the amount of chorine in tap water and to determine the concentration of an iodine solution. To do this, the sodium thiosulfate will need to be standardized using titration. Titration will also be used to determine the amounts of chlorine and iodine. Procedure/Observations: Standardization of Sodium Thiosulfate: A clean 50 mL buret was rinsed with 3 mL of sodium thiosulfate three times, and then filled with the sodium thiosulfate solution. The buret was opened and a few mL were let out to ensure that no air bubbles were present. The initial volume was recorded, and the filled buret was placed in the buret clamp. 25 mL of the KIO 3 solution were measured with a pipette and put into a clean 250 mL beaker. 50 mL of deionized water were added to the KIO 3 and 0.520 g of solid KI. The solution was swirled until the sold KI was dissolved. 2 mL of glacial acetic were added, and the solution turned a brownish-yellowish color. The beaker was placed under the buret. The sodium thiosulfate was added while the beaker was swirled. As the color of the solution in the beaker got lighter, the sodium thiosulfate was added more slowly. When the color was only a faint yellow 1 mL of the starch solution was added, and the solution turned blue. The sodium thiosulfate continued to be added. As the solution got to be a lighter blue, the sodium thiosulfate was added only one drop at a time until the solution became colorless. The final volume of the sodium thiosulfate was recorded. The beaker, and graduated cylinders were washed out with soap and water, and this procedure was repeated two more times. Determination of Chlorine in Tap Water:
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Determination of Chlorine 2 - Determination of Chlorine...

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