GALVANO-GASOMETRIC STUDIES OF MAGNESIUM IN AQUEOUS-SOLUTIONS

The difference effect (Delta) behaviour of magnesium is studied in Na2 SO4, NaBr, MgSO4 and MgBr2 solutions up to 2.0 M concentration using g alvano-gasometry set up. Comparison of the hydrogen gas evolution rate s obtained from galvano-gasometry method and from the atomic absorptio n spectrophotometer (AAS) shows a lower value in the former. A transit ion from positive difference effect to negative difference effect in s odium salt solutions and its absence in magnesium salt solutions are o bserved during the study. The current density at which the transition occurred is termed as transition current density denoted by the symbol i(tau). The relationship of i(tau) with the nature and concentration of the electrolytes are also discussed in this communication.