It has been found that in acid solution (greater than 1M H3O+) the rate expression rate for the reaction of H2O2 with I- is of the form : rate= k2[H2O2][I-][H3O+], where k2 = .25L2*mol-2*s-1 at 25C. Therefore, the rate law over the whole range of acidity from very acid solutions to a neatural solution is given be a two-term rate expression: rate = k1[H2O2][I-] + K2[H2O][I-][H3O+] Where K1 has the value of .0115L*mol-1*s-1 at 25C. Compare the relative magnitudes of these two terms under the conditions employed in your rate measurements for mixture 1. ( you should find what that the second term makes a negligible contribution to the reaction rate at H3O+ smaller than 3 x 10 -4) mixture 1 concentrations H2O2 = 5.3 x10-5 I- = 8.3 x 10 -6 H3O = 10-5
It has been found that in acid solution (greater than 1M H3O+) the rate expression rate for the reaction of H2O2 with I- is of the form : rate= k2[H2O2][I-][H3O+], where k2 = .25L2*mol-2*s-1 at 25C. Therefore, the rate law over the whole range of acidity from very acid solutions to a neatural solution is given be a two-term rate expression:
rate = k1[H2O2][I-] + K2[H2O][I-][H3O+]
Where K1 has the value of .0115L*mol-1*s-1 at 25C. Compare the relative magnitudes of these two terms under the conditions employed in your rate measurements for mixture 1. ( you should find what that the second term makes a negligible contribution to the
3 x 10 -4)
mixture 1 concentrations
H2O2 = 5.3 x10-5
I- = 8.3 x 10 -6
H3O = 10-5
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