Lab 4; Chemistry 2- How fast does Crystal Violet decolorize.docx

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Elena Filippone #0473Chm1046L25 March 2017Investigation 4Section 1Question: How fast does the Crystal Violet decolorize?In this lab experiment, the groups are investigating the concept of Crystal Violet decolorization by using Kinetics to evaluate the rate constant (k) for this particular chemical reaction. Chemical Kinetics is referred to as the study of reaction rates by using a set of known orders (0, 1, and 2) to determine the rate constant in various chemical reactions. This is done by selecting particular moments in the set chemical reaction, taken in the measurement of time (seconds), and plotting it against the concentration of the known solution, the natural log of the known solution, and the reciprocal of the known solution. Once these points are plotted, the datawill create three graphs displaying a trend unique to each order. Each graph will display a coefficient of determination, also known as the R^2, that will tell the experimenter which order the reaction falls under by looking for the R^2 closest to the numerical value of one. Once the reaction is labeled with the appropriate order and matched to the appropriate rate law, the slope of this graph and the concentration of the reactant in excess will be used to determine the rate constant (k). The rate law is defined as a way to illustrate how the rate of the reaction depends onthe concentration of the reaction and is labeled by what chemist call the three orders. This is a concept used frequently in chemical studies when the rate of the reaction is of necessity. This ratecan be defined as the change in concentration over the change in time and can be classified in two opposing ways: The Rate of Disappearance or the Rate of Formation. For the purpose of thisexperiment, the groups will be observing and classifying the rate in terms of disappearance. Section 2First, the groups began by diluting a solution of 5mL of Crystal violet and 5mL of water into 8 unique series, each containing a lower concentration than the solution before it. Using a concept known as Spectroscopy, or the study of the absorption and radiation of light in terms on
Filippone 2concentration and absorption, the groups were able to come up with a linear regression equation

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