Iodine And Hydrogen Peroxide Reaction Lab Report
The purpose of this experiment was to determine the speed at which a reaction took place between an iodine and hydrogen peroxide solution. In addition to a change in concentration, a change in temperature and a catalyst variable was also introduced to conclude whether or not their presence affected the overall speed of the reaction. In order to determine the effects of these variables, several iodine and hydrogen peroxide reactions were prepared, (all at varying temperatures, volumes, and concentrations), and reacted until the solutions color turned from clear to dark blue. This change in color was a result of the starch solution made from the hydrogen peroxide and iodine solution reacting with the sodium thiosulfate. The blue color merely
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The first step in the procedure was to obtain and label ten test tubes and also three 50 mL beakers with the labels of sodium thiosulfate, potassium iodine, and hydrogen peroxide. Then 20 mL of sodium thiosulfate, 25 mL of potassium iodine, and 35 mL of hydrogen peroxide were added to their respective beakers. Next, 2.0 mL of sodium thiosulfate was added to test tubes 1-9 using a volumetric pipet. After that, potassium iodine and distilled water were added to the test tubes 1-9 with their respective amounts given by Table 1 in the lab manual. Sodium molybdate, a catalyst, was added to test tubes 6-8, and 10 mL of peroxide solution was added to test tube 10. An ice bath was also prepared for test tubes 8-10 to chill in for approximately 20 minutes. Part B of the experiment served to determine the reaction rates. Hydrogen peroxide was added to each test tube and the reactions were observed one by one. Once the hydrogen peroxide was added, an online stopwatch was started and a temperature probe was placed in the test tube to monitor the reaction. The timer was stopped when the solution turned blue and the temperature and time were recorded. This procedure was repeated for test tubes 2-7. For test tubes 8 and 9, the chilled hydrogen peroxide from test tube 10 was used instead of the room temperature hydroxide. Clean up protocols were then
The first step in the procedure was to obtain and label ten test tubes and also three 50 mL beakers with the labels of sodium thiosulfate, potassium iodine, and hydrogen peroxide. Then 20 mL of sodium thiosulfate, 25 mL of potassium iodine, and 35 mL of hydrogen peroxide were added to their respective beakers. Next, 2.0 mL of sodium thiosulfate was added to test tubes 1-9 using a volumetric pipet. After that, potassium iodine and distilled water were added to the test tubes 1-9 with their respective amounts given by Table 1 in the lab manual. Sodium molybdate, a catalyst, was added to test tubes 6-8, and 10 mL of peroxide solution was added to test tube 10. An ice bath was also prepared for test tubes 8-10 to chill in for approximately 20 minutes. Part B of the experiment served to determine the reaction rates. Hydrogen peroxide was added to each test tube and the reactions were observed one by one. Once the hydrogen peroxide was added, an online stopwatch was started and a temperature probe was placed in the test tube to monitor the reaction. The timer was stopped when the solution turned blue and the temperature and time were recorded. This procedure was repeated for test tubes 2-7. For test tubes 8 and 9, the chilled hydrogen peroxide from test tube 10 was used instead of the room temperature hydroxide. Clean up protocols were then