I2+ Na2S ==2NaI +S
2KMnO4+3Na2SO3+2H20=====2KOH+3Na2SO4+MnO2(高锰酸钾褪色,有棕黑色沉淀生成)
Na2S+H2SO4===H2S+Na2SO4
2Na2S+Na2SO3+3H2SO4===3S+3H20+3Na2SO4
I2+ Na2S ==2NaI +S
2KMnO4+3Na2SO3+2H20=====2KOH+3Na2SO4+MnO2(高锰酸钾褪色,有棕黑色沉淀生成)
Na2S+H2SO4===H2S+Na2SO4
2Na2S+Na2SO3+3H2SO4===3S+3H20+3Na2SO4