Answer to Question #93906 in General Chemistry for Kylie

Question

Consider the reaction of sodium hypochlorite with iodine.

What is the role of starch in this titration? Why is it added near the end point of the titration, and not at the beginning?

Answer 1

Starch is now used as an indicator for the presence of iodine. ... As to why it is added near the end of the titration rather than at the beginning is because the starch-iodine complex at high I2 concentrations is relatively stable.