Morphology and Composition of the Precipitate Obtained from the [Ag(S_2O_3)_2]~(3-)-S_2O_3~(2-) -Solutions by Cementation with Magnesium Scrap

摘要

The morphology and composition of the sediment obtained by cementation with magnesium scrap from solutions 0.0025-0.01M [Ag(S_2O_3)_2]~(3-)- + 0.5M S_2O_3~(2-) at t = 20-40°C is studied. It is shown that a disperse sediment of silver and sulfur is formed in a wide range of concentrations. This sediment is easily detached from the magnesium surface. In this case, the content of sulfur in it decreases as the [Ag(S_2O_3)_2]~(3-) concentration and temperature are increased. It is established that the final product of cementation of the[Ag(S_2O_3)_2]~(3-)-S_2O_3~(2-) solution by the composition corresponds to Ag_2S.