Chemical Reaction Lab

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The Rate of Chemical Reaction and the Factors Affecting Reaction Rates The purpose of these labs is to investigate and determine how three factors- concentration, temperature, and a catalyst- affect the rate of a chemical reaction. In the first lab, “Rate of Chemical Reaction,” 1 x 8-well micro strips were used to combine a potassium iodate solution and a sodium meta-bisulfite solution under different conditions; each trial was timed from the point of the first visible reaction until the last well reacted. Likewise, in the second lab, “Factors Affecting Reaction Rates,” eight trials were completed to observe the affects of certain factors on the reaction rate; however, test tubes were used instead of wells and each trial was timed from the …show more content…
In part one, the effects of concentration on the reaction rate was observed. The amount of potassium iodate and water varied; starting with five drops of potassium iodate and zero drops of water and eventually reaching one drop of potassium iodate and four drops of water in the last trial. The amount of solution B remained the same throughout the trials- one drop of sodium meta-bisulfite and one drop of starch. Once every trial was complete, it was apparent that the concentration of potassium iodate has an direct relationship with the reaction rate. For example, when the potassium iodate concentration was …show more content…
In the first lab, when the two wells were aligned, not all of the solutions completely mixed, delaying the time of reaction of certain wells. In addition, some wells simply did not react. The pipets also create different sized drops occasionally, which could alter the ratio of solutions. When reusing the wells for different trials, they could have possibly became contaminated. Finally, when observing the affects of temperature, the results could vary due to a non-definite temperature. In both labs there were similar errors. For example, the sodium meta-bisulfite degrades over time which could have altered the data in both experiments. In addition, the reaction rates are only approximations, because it is not physically possibly to time the exact moment of mixture and the exact moment of the first visible sign of reaction. Finally, the starch solution used for the both labs is not reliable, because instructions were not definite and contained the words “spray generously.” These experimental errors could be resolved by preventing contamination by using different wells each time, using a thermometer to create more precise temperatures for more accurate data, creating new solutions before doing trials, and finding exact, proportional values to create the starch solution. These two labs had an abundance of experiment error, however, The second lab was more accurate than the first, because it consisted

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