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Analysis of Reaction Kinetics

Stephanie Davison Brenton Foretich Brian Rose Darin Winter

Darin Winter

on 26 April 2010

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Transcript of Analysis of Reaction Kinetics

Double click anywhere & add an idea Analysis of Reaction Kinetics Lab Presenters:
Stephanie Davison
Brenton Foretich
Brian Rose
Darin Winter Outline 1. Brief Overview of the Lab
Purpose, Desired Values

2. Data Analysis
Analysis of data, differences in procedures, etc.

3. Conclusions

4. Recommendations Study the reaction kinetics of a phenolphthalein fading reaction in an isothermal batch reactor with a sodium hydroxide solution

Determine: the equilibrium and kinetic constants as well as the activation energy for the fading reaction

OBJECTIVES Calculation Methods 1. Solve for using the transmittance data

2. Plot v. time

3. Calculated K using
4. pH from measured values in raw data
averaged and assumed constant throughout the lab
[OH-] calculated using 14=pH + pOH, pOH=-log[OH]
5. = calculate kb and kf* and kf
6. Plotted ln(K) v 1/T, ln(kf) v 1/T, and ln(kb) v 1/T on the same graph
Used the slope of the graph and determined using its relationship
to the the equation

Reported Data Example of Data Points Used
(From Group 5) T (infinity) Activation Energy To more accurately find our Ea forward and backwards we should run the experiment at more temperatures.

Arrhenius Equation takes two data points and fits a line, but if one of the points has an error the line will diverge from the true value. Activation Energy Graphs Recommendations in the future
Overall: Experiment is far too dependent on assumptions
1. pH needs to be taken more often than every 15 min
2. More accurate if the experiment is conducted over a shorter period of time
-results near equilibrium only add to the error
3. More precise instruments needed
-Transmittance reader fluctuated significantly
-perhaps an electric spectrophotometer (digital)
-thermometers and heating instruments incapable of maintaining any
consistent temperature
-aka need more accurate instruments
4. Experiment should also be repeated at T=30C and 90C.
-Since two more data points are collected, the plot of Ln (kf) versus (1/T)
will have fewer errors, thus activation energies can be calculated in a
more accurate way.
5. tubes used should be placed in a more stable set up so that they do not cause
-unsteady flow into and out of the spectrophotometer
Two atoms bump into each other. The one says "Don't move I think I've lost an electron". "Are you sure?" asks the other atom. "I'm positive." responds the first. The y-intercept should be set equal to 0 because there is no intercept in the linear fit line.
Also the first data point is equal to 0 according to the model. Y-Intercept
Full transcript