MICROCOMPUTER CONTROLLED POTENTIOMETRIC TITRATION SYSTEM FOR EQUILIBRIUM STUDIES

A microcomputer controlled automatic potentiometric titration system has been developed for solution equilibria studies. It is programmed, using Programmable Read Only Memory (PROM) to deliver an optimized volume of base that will correspond to uniform changes in electrode potential throughout the entire titration. Data are output via a thermal printer and a hardware option is available for recording the same data on magnetic tape using a cassette recorder. The choice of data processing algorithm employed to elucidate all equilibrium parameters is left to the user. Trial titrations demonstrate that the system can produce data that lead to very precise and accurate equilibrium constants. The pKas of ascorbic and benzoic acids have been redetermined to be 4.004 and 3.993, respectively in 0.100 M KCI at 25.0 °C. The hardware has been designed to permit the conversion of this system to a multiple end-point titrator simply by replacing the existing PROMS. © 1978, American Chemical Society. All rights reserved.