I am trying to to balance the following reaction by oxidation number method NaI + H2SO4 -----> Na2SO4 + I2 + H2S +H2O I split it into two half reactions... I multiplied the NaI by 2 bc there were two I on the other side; they gave up 2e- the H2SO4 and H2S gained 5e- I multiplied by 5 and 2 respectively in order to balance the electrons. I can't get the equation to balance though! Everything works out except I can't get the H and O to balance! Thanks for any help!