... is of the form; d [IO3-] =k([IO3-] m,[I-]n,[H+}p,.) dt (Equation 3) where m, n, p,... are determined by experiment, and each exponent in the equation is the order of the reaction with respect to the corresponding species, and the algebraic sum of the exponents is the overall order of the reaction. The equation for the reaction of arsenious acid and I3- : H3AsO3 + I3- + H2O?H AsO42- + 3I- +4H+ (Equation 4) While the equation for the overall reaction, up to the time of the starch end point, can be written as: IO3- + 3H3AsO3 ? I- + 3H AsO42- + 6H+ ( Equation 5) To compute the initial rate of the reaction in terms of the initial concentration of H3AsO3, use the following equation: Rate = [H3AsO3]0 t (sec) ( Equation 6) To compute the values of the exponent m, n, and p the following equations can be used: m = log (rate1/rate2) log ([IO3-]1/ {IO3-]2) ...

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