Resumen de From Titration Data to Buffer Capacities:: A Computer Experiment for the Chemistry Lab or Lecture
Roy W. Clark, Gary D. White, Judith M. Bonicamp, Exum D. Watts
This paper, for chemistry teachers who have beginning students, computers, and spreadsheets, presents tables of titration data simulated using the program EQUIL. Instructors are invited to give students the titration data to enter into their spreadsheets, have them plot it in several ways, and produce an assortment of graphs. In the process, they will discover many things about pH,. the taking of derivatives, buffer capacity, and the way buffers behave upon dilution. These resulting plots show why there is pseudobuffering at high and low pH values, and show the equilibrium buffering maximum at the pKa or pKb of the electrolyte species. A convenient definition of buffer capacity with respect to dilution is beta dil, where beta dil = d(-log[conc]/d(pH). This definition has the advantage of being an intensive property of the solution, and also of being large for equilibrium buffer solutions undergoing dilution.
