# Fecl3 And Ki Essay

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Fecl3 And Ki Essay
Trial | [FeCl3] (M) | [KI] (M) | Initial rate (sec -1) | 1 | .01 | .01 | .002246 | 2 | .01 | .005 | .001348 | 3 | .005 | .01 | .001627 | 4 | .0075 | .005 | .001126 | 5 | .005 | .0075 | .001267 |

Order of Reaction: n=1;m=1
R1/R2=.002246/.001348=k[.01][.01]/k[.01][.005]
1.666172=2n n=1

Rate law Expression:
Rate=k[FeCl3][KI]

Rate Law constant:
Trial 1: .002246=k[.01][.01] k=22.46
Trial 2: k=26.96
Trial 3: k=32.54
Trial 4: k=30.027
Trail 5: k=33.787
Average Rate Constant: Trial1+2+3+4+5=145.774/5=29.1548

Procedure
Obtain and wear goggles. Connect a Colorimeter to Channel 1 of the Vernier computer interface. Connect the interface to the computer with the proper cable. Start the Logger Pro program
Measure 20.0 mL of KI solution into a second 100 mL beaker. Remove the cuvette from the Colorimeter and pour out the distilled water. Add the 20.0 mL of FeCl3 solution to the beaker of KI solution. Swirl the beaker to mix. Rinse the cuvette twice with ~1-mL amounts and then fill it ¾ full. Wipe the outside of the cuvette with a tissue, place it in the Colorimeter, and close the lid.
Click to begin collecting absorbance data. Data will be gathered for 2 minutes. Observe the progress of the reaction in the beaker. When the data collection is complete, carefully remove the cuvette from the Colorimeter. Dispose of the contents of the beaker and cuvette as directed. Rinse and clean the beakers and the cuvette for the next trial. Examine the graph of the first trial. Select a linear region of the graph that covers about 30-40 seconds of the reaction. Click the Linear Regression button, . Record the slope, as the initial rate of the Trial 1 reaction, in your data table and then close the Linear Regression box.
10. Repeat Steps 6-9 to conduct Trials 2-5. Note: You will not perform Step 6c in Trials
To do this one uses Beers Law which states that the absorbance of a molecule is linearly proportional to the thickness of the sample, the concentration of the absorbing medium, and the absorption, which is a measure of a given molecule's ability of absorb light. To perform this experiment one will use a Colorimeter. A colorimeter is a light-sensitive instrument that measures how much color is absorbed by an object or substance. It determines color based on the red, blue, and green components of light absorbed by the object or sample. When light passes through a medium, part of the light is absorbed, and as a result, there is a decrease in how much of the light reflected by the medium. A colorimeter measures that change so one can analyze the concentration of a particular substance in that medium. A colorimeter works on the basis of Beers law, which says that the absorption of light transmitted through a medium is directly proportional to the concentration of the

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