NaHSO3+NaHSO4 == Na2SO4+SO2↑+H2o
HSO3- + H+ === H2O + SO2↑
NaHSO3+NaHSO4==Na2SO4+SO2↑+H2OH+ + HSO3- ==SO2↑H2O
HSO3~+HSO4~=SO4 2~+SO2↑+H2O