先生成硫代硫酸银(Ag2S2SO3)白色沉淀,但不稳定,很快生成,硫化银(Ag2S)黑色沉淀.
2(Ag+)+(S2O3 2-)=Ag2S2O3沉淀
Ag2S2O3+H2O=Ag2S+2(H+)+SO4 2-