1. The problem statement, all variables and given/known data OCl- is reacted with I- in acidic solution to generate I2. The I2 generated is then titrated using a solution of Na2S2O3. If you look at the sum of the two reactions above, information about S2O3- can be used to determine the amount of I2 and thus the amount of ClO-. Give the relevant balanced equations for the titration of OCl- with S2O32-. Including all redox half reactions there are three. 2. Relevant equations N/A 3. The attempt at a solution First I figured out the two equations. I think they are: OCl- + H2O + 2I- ---> Cl- + 2OH- + I2 I2 + 2S2O32- ---> 2I- + S4062- Are those correct? Is it different because it's in acidic solution? The OH- make me think I did this in basic solution, but I'm not sure. Then I added the two equations together to find: OCl- + H2O + 2S2032- -----> Cl- + 2OH- + S4062- If the last equation is correct, I don't see how that works. There's no I2 in the equation. The question says I need to go from thiosulfate ion, to I2, then to OCl-... hmm. What am I doing wrong? Thanks!