Question

Calculate the concentration of KIO3(aq) present at the beginning of a reaction when 2.00 mL of 0.020 M KIO3(aq) is mixed with 8.00 mL of other solutions so the initial volume for the reacting mixture is 10.00 mL.

Answer 1

This is just another dilution problem.
millimoles KIO3 initially (and finally) = mL x M = ?

Then final concn = mmols/mL = ?mmols from above/10 mL = ?