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Landolt Iodine Clock Reaction Essay

973 words - 4 pages

The Landolt Iodine clock reaction is used to show chemical kinetics and reaction mechanisms as well as the effect concentration has on reaction rates. Mechanisms are a very exact and detailed way of telling what happens to molecules at each level in a reaction. Mechanisms include things such as how the molecular geometry of the reagents change throughout the reaction and tells which bonds are broken/formed. In this reaction, two clear liquids are poured together into a beaker and mixed. It yields a clear liquid. However, after waiting for a few minutes, the clear liquid isn’t clear anymore, but is a dark blue. The “clock” in the title of the experiment really isn’t a clock at all. It just ...view middle of the document...

The second part of the reaction happens very quickly, meaning that the starch doesn’t have time to form a complex. While the reaction is trying to change color, the first two equations are reacting. In the second equation, the iodide is reused in order for it to be able to react with the hydrogen peroxide in the first equation. Thiosulfate is used up as soon as it has become tetrathionate.
When all of the thiosulfate is used up triiodide is able to react with the starch in the next equation: I3- + starch → (I3- starch complex). Here the triiodide reacts with the starch to form a complex, in this case, the dark blue color. Triiodide is also an intermediate, because it is formed during a reaction but also reused to form the starch complex. The speed to which all three of these equations happen depends on the concentration of the reactants, which is found by determining the rate the law of the reaction. A rate law is found by comparing trials of the reactions, where each trial contains the concentration of the reactants as well as the time it took for the substance to change color. For this experiment, the rate of the reaction depends on the concentration of the hydrogen peroxide. The rate law would be, rate=k(H2O2)x. The power to which the concentration of hydrogen peroxide is raised is determined by comparing the trials of the reaction. When they are compared, one is able to find the order of the reaction. K is the rate constant, which is usually in units of seconds, but can be in any other unit of time too. The concentration of the hydrogen peroxide is in molarity, also known as moles per liter. When one finds the order of the reaction, they are able to take the concentration of the chemicals multiplied by the order of the reaction. The...

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