ASSESSMENT OF LINEARITY BETWEEN STEADY-STATE LIMITING CURRENT AND ANALYTICAL CONCENTRATION OF WEAK ACIDS IN THE REACTION OF HYDROGEN EVOLUTION

The reaction of hydrogen evolution from the acids: hydrochloric, hydro gen sulfate ion, monochloroacetic and lactic have been studied by stea dy-state voltammetry at platinum microdisc electrodes. From the experi mental voltammetric parameters, such as half-wave potential, (E(1/4)-E (3/4)) values and steady-state limiting current, it has been ascertain ed that the second order CE mechanism, involved in the discharge of pr otons arising from the weak acids investigated, is characterized by a chemical reaction which is fast over the whole concentration range exp lored. Theoretical calibration plots have been examined in the concent ration range 1x10(-6)-1x10(-1) M and the zone over which linearity exi sts has been verified both from a theoretical and experimental point o f view.