Electrochemical & Thermodynamic Behaviour of Palladium-Palladium Sulphide Electrode in Presence of Sulphide Ions

Abstract

The Pd-PdS electrode is reversible in respect of S^2- in aqueous, aquo-alcoholic and alkaline media. The plot of E_pd-PdS versus log[S^2-] is linear showing that the electrode can be successfully used in the quantitative determination of S^2- in aqueous, aquo-alcoholic and alkaline media. The values of <em>E</em>ᵒ, (<em>∂</em>Eᵒ/∂T)_P and thermodynamic functions; viz. <img src='http://www.niscair.res.in/jinfo/delta.gif' border=0><em>G</em>ᵒ, <img src='http://www.niscair.res.in/jinfo/delta.gif' border=0><em>H</em>ᵒ and <img src='http://www.niscair.res.in/jinfo/delta.gif' border=0><em>S</em>ᵒ for the electrode reaction: Pd_(s)+ S^2- _(aq.) <img src='http://www.niscair.res.in/jinfo/harpoon.gif' border=0> PdS_(s) + 2e, and the solubility product have been determined.