Rate = k [IO3-][SO42-][H+] (if pH changes, how does rate change)?

By What factor will the rate of reaction change if the pH changes from 4.5 to 2.0Rate = k [IO3-][SO42-][H+] (if pH changes, how does rate change)?
The rate equation shows that the reaction is first order with respect to the concentration of H+.



Since pH = - log [H+]



At pH 4.5, [H+] = 3.16 x 10^-5 M

At pH 2.0, [H+] = 1.0 x 10^-2 M



So the rate of reaction changes by the factor of 1.0 x 10^-2 /3.16 x 10^-5 = 316. It is 316 times faster when the pH changes from 4.5 to 2