S2O32-+2H+==S+SO2(气体标箭头)+H2O
硫代硫酸钠标准溶液的配制和标定:(依据国标GB/T5009.1-2003)C(Na2S2O3)=0.1mol/L1.配制:称取26g硫代硫酸钠(Na2S2O35H2O)或16g无水硫代硫酸钠,及0.2......