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This simple TI-83 program is for for solving integrated rate law problems.

You select either, zero order, first order, or second order, and the program gives the following:

1. The form of the integrated rate law for that order
2. The relationship between time and concentration that yields a linear relationship
3. The equation for calculating the half-life

If you have data for the time and concentration relationship of a particular reactant, you should enter the time data into L1 (list 1) and the concentration data into L2 (list 2) PRIOR to beginning the program. If this has be done, you can opt to have a regression analysis done on the list data, with statistical diagnostics performed. The program will turn on your calculator's diagnostics for you. The diagnostics will give you the correlation coefficient, r, for the linear relationship  between time and the variation of the concentration for that order reaction. Diagnostics will also give r squared, the coefficient of determination. Simply put, the closer these diagnostic values are to 1.000, the more closely the data adheres to a linear graph.

The program automatically manipulates the list data to examine the following relationships:

1. Zero order: time and [conc]
2. First order: time and ln[conc]
3. Second order: time and 1/[conc]

However, it will only do one analysis per "pass" through the program. Simply hit enter after one regression analysis to return to the start of the program and continue your analysis for the other orders.

As with any program freely distributed, you are free to pass this program along, provided you do not charge for it. I take no responsibility for the results you get using the program. 

As a word of warning: The program should be used only by persons who UNDERSTAND the application of these laws. 


Andy Allan
www.sciencegeek.net

