Final answer:
The concentration of iodate, represented by 2^s, is based on the stoichiometry of the reaction between iodate ions (IO3-) and another chemical species, such as thiosulfate ions (S2O3^2-).
Step-by-step explanation:
The concentration of iodate, represented by 2^s, is based on the stoichiometry of the reaction between iodate ions (IO3-) and another chemical species, such as thiosulfate ions (S2O3^2-). In this reaction, each iodate ion reacts with two thiosulfate ions, so the concentration of iodate is proportional to 2^s.