Final answer:
To determine the amount of KIO3 required, a titration method is used, similar to how concentrations of substances are determined in examples with ascorbic acid and oxalic acid. The precise calculation requires knowledge of the reaction's stoichiometry and the molarity of KIO3.
Step-by-step explanation:
The determination of how much KIO3 is required after finding the vitamin C content in a 25mL sample involves a chemical process known as titration. A known concentration of KIO3 would be used to oxidize vitamin C, and then any excess KIO3 would typically be titrated with a secondary reagent to determine the amount reacted with vitamin C. This process is similar to the given examples where different reagents and titration methods are used to find the concentration of various substances, like ascorbic acid in orange juice using iodometry and oxalic acid with permanganate titration.
To calculate the exact amount of KIO3 needed, one would need to know the chemical equation for the reaction between KIO3 and vitamin C, the molarity of the KIO3 solution, as well as the end point of the titration to determine the volume of KIO3 that reacted with the vitamin C.