How is bromine measured by titration with sodium thiosulfate?

To determine the quantity of free bromine, it is titrated with sodium thiosulfate in the presence of potassium iodide.1

Additionally, if bromide is oxidized to bromate using hypochlorous acid, the excess oxidizing agent is removed with sodium formate. Following this, potassium iodide and acid are added to liberate iodine, which is then measured by titration with sodium thiosulfate.1

In these analytical processes, the titration involves the reaction of the liberated iodine with a standardized solution of sodium thiosulfate, often utilizing starch as an indicator to identify the endpoint.12