Abstract
Summary The chemical and electrochemical properties of mercury have been investigated by voltammetry and potentiometry in molten potassium hydrogenosulphate ( t =220°C, P (H 2 O)=0.041 atm). These studies showed that mercury was corroded in acidic media. The mercurous, Hg 2 2+ , and mercuric, Hg 2+ , ions exist for low pH values, but precipitate in basic media as Hg 2 SO 4 and HgSO 4 . The mercuric sulfate is dissolved in KHSO 4 for higher pH value as Hg(SO 4 ) 2 2− . Equilibrium acid-base constant values and standard potentials are given [p K (Hg 2 2+ , Hg 2 SO 4 (s))=−1.1±0.1; p K (Hg 2+ , HgSO 4 (s))=−0.3±0.1; p K (HgSO 4 (s), Hg-(SO 4 ) 2 2− )=2.8±0.1; E 0 (Hg/Hg(I))=0.178±0.007 V; E 0 (Hg(I)/Hg(II))=0.381±0.010 V] and the potential-pH diagram is deduced.
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