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Iodine Clock Reaction Lab Report

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After it was first discovered in 1886 by Hans Heinrich Landolt, the iodine clock reaction has become one of the most used classroom experiments for demonstrating kinetics (SuperchargedScience, 2018). A clock reaction is a reaction where one of the chemical species (clock chemical) starts off with a low concentration and then has a rapid increase which can then lead to a dramatic colour change (UnitverityNottingham, 1999). The iodine clock works by using iodine as the clock chemical that then reacts with clear starch to produce a deep blue colour.
For the Landolt chemical clock in two clear liquids are mixed with one containing KIO3 and the other NaHSO4 they then follow the following chemical reactions.
Equation 1 is known as the rate determining …show more content…
This is mainly due to a dilution having to be done to decrease the molarity which could have led to an incorrect molarity of the substances mixed. This could have been fixed by preforming a titration, however, due to time constraints this was not done and the molarities were assumed to be correct. If the concentration of the substances was less than thought the reaction time would increase. Conversely, if the concentration was more than though the reaction time would decrease. Once again this would directly affect the results as the reaction time is used in the calculations.
When conducting the temperature test only one of the mixtures was heated up. This meant that when the mixtures were poured together the temperatures of the two mixtures equalised and this drop in temperature was not taken into consideration in the results. If there was a decrease in temperature then the reaction time would have increased. The severity of this drop in temperature is unknown but it does effect the results directly. A way to fix this problem for future time would be to heat up both liquids simultaneously. This would mean that there is no temperature drop reducing the inaccuracy in

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