In an attempt to determine the percentage availability of chlorine in a sample of sodium hypochlorite solution, a student pipetted 10mL of the sample into a glass stoppered conical flask. To the sample, he added 10 ml of 10% KI solution and 2mL of dilute acetic acid. While swirling, he titrated the solution with 0.1M sodium thiosulphate solution Vs until the deep brown color of iodine in the solution was almost faded. He then added 2mL of freshly prepared 1% starch solution and continued the titration until the blue-black color just faded away. Given that the solution required 20.6mL of the thiosulphate for the reaction to go to completion;

1. What type of reaction is represented above?

2. Write a balance chemical equation for the reaction.

3. Calculate the % available chlorine in 10mL of the sample