Below is a sample set of data for run 1 from the reaction tables: Time (min) 0 1

Question

Below is a sample set of data for run 1 from the reaction tables:
Time (min)     0            1          2           3         4             5

Absorbance: 0.237   0.235   0.232    0.23   0.227 0.224

1) Use the initial concentration of I3– (compute using dilution calculations for run 1and the stock concentration of 0.0400M) and the absorbance reading for zero minutes to estimate a value for the molar extinction coefficient of I3–.







2) Based on the five minutes of data presented, use a graph and best fit line to estimate the initial rate of the reaction with respect to I3-. Attach your graph to this pre-lab and write both the best fit line and the initial rate (including units) in the space below.


Best fit line: ___________________________________________


Rate: _________________________________________________

Explanation / Answer

1)

Formula: Absorbance = molar extiction coefficient x concentration x path length of cell

Assume path length of cell is 1 cm.

Given: Concentration = 0.0400 M and absorbance = 0.237

Molar extiction coefficient = Absorbance / (concentration x path length of cell)

= 0.237 / (0.0400 M x 1.00 cm)

= 5.925 M-1cm-1

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