Question: why kscn is used in iodometry?
Answer: The KSCN is added to displace the adsorbed I2 making it accessible to the starch collodial particles, hence yielding a sharper endpoint. The iodine will be titrated with a standardized solution of sodium thiosulfate (Na2S2O3). ... Be sure to record to volume of sodium thiosulfate needed to react with the iodine.