Abstract
An apparatus is described with which it is possible to operate hydrogen gas electrodes on platinum in ammonium salt solutions in liquid ammonia. These electrodes have been shown to be reversible and to give stable, reproducible and accurate e.m.f.'s at −40°C over prolonged periods of time after an initial settling down period of 4–6 hr. The work proves conclusively that it will be possible to use hydrogen-on-platinum half-cells as primary standards for electrode potentials in liquid ammonia. E.M.F. data for the concentration cell with transference, Pt H 2 | NH 4 NO 3m 2| Pt H 2 in liquid ammonia, are given. From these data it is possible to assess the ammonium ion activities and concentrations over a wide range of concentrations of ammonium nitrate. The free energies of dilutions of ammonium nitrate in liquid ammonia from 10 −2 molal to several other concentrations are given.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
