1. The problem statement, all variables and given/known data Find the concentration of I- involved in the Iodine Clock Reaction 2. Relevant equations I think this will involve m1v1=m2v2 --- but I am not sure. 3. The attempt at a solution We did nine 'iodine clock' reactions to demonstrate chemical kinetics. I'll use the second one as an example. We added 7.50mL of 0.200 M KI, 2.50ml of 0,200 KCl, and 5.00mL of 0.0050 S2O32-, and one drop of starch to one flask. We then added 5.00mL of S2O82- to another flask. We then mixed them together in a beaker. The total amount of solution is 20mL. It turns dark blue/black in about a minute. I need to figure out the concentration of I-. I understand that the reaction I need to investigate is: 2I-(aq)+S2O82-(aq) [tex]\rightarrow[/tex]I2+2SO42- I'm not sure how I can get the concentration from this. I know how to get the concentration of KI, but I don't know how to get only the I-. Again, I think it has to do with the equation listed above, but I'm not sure.