A Computer Generated Titration Exercise We have developed a computer pmgram which is designed far use as an exercise in teaching titration and use of titration curves. The pmblem presented is that of titrating a weak acid with a stmng base. The experiment is completely computer simulated. The computing system used is a Hewlett-Packard Model 9820 programmable calculator with plotter. The exercise consists of the following steps: (1)The student calls up the program; (2) The computer plots a set of axes for volume of base added (in ml) versus pH while randomly selecting an acid normality and pK, (between reasonable limits); (3) The student selects a base normality and begins titrating by adding base in whatever increments he chooses (in ml). As base is added, the computer plots the titration curve. If the student passes the endpoint too quickly, the computer informs him and aharts the titration. (4) After an adequate titration curve has been obtained, the student must determine the equivalence pH, pK. of the acid, and normality of the base. (5) The computer either aceeptsor rejects the answers. When correct answers are given, the computer gives and plots thevalues. The pmgram is used as an aid in freshman chemistry courses and can be adapted to many interactive computing systems. Copies of the program are available on request. Craig V. Bishop M. A. Wartell Metropolitan State College Denver, Colorado 80204
Volume 52, Number 3, March 1975
/
187
