[newbie!]

first of all hi! i;m new here!
currently a second year undergraduate student from the uk.
looking for help with the following questions pls!

1) write a balanced equation for the reaction of IO3- with I- to form I2

2)write a balanced equation fot the oxidation of I2 by IO3- in the presence of Cl- to form ICl2-

ok for this one i have a graph and it asks me to identify the cell potential at the half end point. i;mnot sure would this be the halfway point or the end?
it also asks for the E0 value- how do i calculate it?