Answer to Question #329377 in Chemistry for Riya

Question

What is the function of starch in an iodometric titration? Why should starch solution be added just before the end-point of the titration?

Answer 1

Starch is a viable indicator in the titration process because it turns deep dark blue when iodine is present in a solution. When starch is heated in water, decomposition occurs and beta-amylose is produced. Beta-amylose combines with iodine, resulting in a dark blue color change.