Original scientific paper

Heterogeneous Exchange of Amalgams. II. Hydrogen Ion Concentration Effect on the Zn-Amalgam -Zn++ (S04--) Solution Exchange

A. Filip ; Boris Kidric Institute of Nuclear Sci ences, B elgrade, Serbia and Faculty of Science, D_niversity of Zagreb, Zagreb, Croatia, Yugoslavia
M. Mirnik ; Boris Kidric Institute of Nuclear Sci ences, B elgrade, Serbia and Faculty of Science, D_niversity of Zagreb, Zagreb, Croatia, Yugoslavia

Abstract

The effect of hydrogen ion concentration on the exchange
of a Zn-amalgam-Zn2+ (S04--) solution in bMh the presence and
absence of oxygen has been investigated. The technique of radioactive
indicators was used and it was found that in an atmosphere
of nitrogen, the exchange rate does not change in the pH 4-6
range. From pH 2-4 the exchange rate is inversely proportional
to the hydrogen ion activity. In the presence of oxygen from
pH 2-6, zinc from the amalgam dis solves completely. At a
partial oxygen pressure of 0.2 atm. at hydrogen ion concentrations
ranging from 1 X 10 -s - 2.6 X 10 -2 g. ion 1.- 1 the zinc dissolves
by two processes. The principal proceiss due to depolarization
takes place by the reaction 02 + 2H20 + 4e- ~ 40H- . At a
partial oxygen pressure of 1.0 atm ., zinc dissolves by only one
process owing to the depolarization of oxygen by the same
reaction.

Keywords

Hrčak ID:

208207

URI

https://hrcak.srce.hr/208207

Publication date:

15.11.1965.

Visits: 607 *