Two Basic Programs for Plotting Theoretical Neutralization Titration Curves Mast computer programs that print out plots of various types are written in Fortran N. For several reasons, including the non-availability of Fortran IV on some small computers, i t is desirable that plotting programs written in Basic be available. However such programs are hard to find in the literature. Therefore we have written two Basic programs for plotting the results of p H calculations of neutralization titrations of weak acids with a strong base. The first of these programs uses Newton's method of successive approximations to calculate and print a plot of the p H a t various points in the titration of 50.0 ml of a weak monohasic acid with 0.100 M strong base. Both the concentration and the strength of the acid may be varied. The p H scale automatically adjusts itself depending upon the initial p H of the system. The size of the increments between points may also be adjusted, as well as the starting and stopping points of the titration. The only simplifying assumption that is made is to replace activities with molar concentrations. The second program is similar to the first except that it calculates and prints a plot of the pH a t various points in the titration of 25.0 ml of a weak dibasie acid with 0.100 M strong base. Again, both the concentration and the two dissociation constants of the acid may be varied. Documentation and copies of the programs along with sample outputs may be obtained from the author.
Qlheatan College Norton, Massachusetts 02766
738
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Journal of Chemical Education
Herbert R. Ellison
