hi! i came across a section in my chemistry notes concerning "iodine-thiosulfate titrations" and i think it must be important cause it came out for my CTs =(. I don't understand most of what the notes say, and searches on the internet have proved futile.
what i do gather is that:
1)iodine is very volatile and in pure form, that is, I2, it will evaporate into the air,
2)it is a back titration
3)it involves the reaction of iodine and "a few drops of starch"
Does anyone know more about this titration? i need help on the following questions:
1) what is the purpose of this titration?
2) why is starch added?
thanks!