Rate of Reaction: How Does H+ Concentration Affect It?

[Neophyte]

Homework Statement

Consider the reaction with the rate law, Rate = k[BrO3-][Br-][H+]²
By what factor does the rate change if the concentration of H+ is decreased by a factor of 3? Just put in the number as a whole number or fraction.

Homework Equations

The Attempt at a Solution

Isnt the answer 1/8 ?
2^3 = 8

 

[Borek]

No, it is not 2^{concentration} but concentration².