Physical and chemical bases of synthesis of cobalt (II) sulfide in the reverse microemulsion

This paper presents the research results of stability of reverse microemulsion which consists of sodium dodecyl sulfate (SDS) / n-butanol - water - heptane in the presence of an aqueous phase dissolved cobalt(II) sulfate and sodium sulfide. The results of the spectrophotometric and conductometric studies of microemulsion have been presented. The dependence of reverse microemulsion electrical conductivity and optical density on the phase relation has been indicated. Based on these results some assumptions of the ongoing structural changes in the microemulsions have been made. Thermodynamic calculation describing boundary formation of cobalt(II) sulfide precipitate in aqueous solution depending on pH has been carried out, the competing hydrolysis reactions have been estimated.