The independent molecule and ion temperature dependence of the rate coefficient for the H3O+ and (C2H2)(2) reaction producing C2H5O+ are determined using a coaxial molecular beam radio frequency ring electrode ion trap (CoMB-RET). The H3O+ temperature is varied from 25 to 170 K, while the equilibrated C2H2/(C2H2)(2) beam temperatures sampled are 160, 180, 200, and 220 K The rate coefficient of the H3O+ + (C2H2)(2) reaction is determined to be 4.0 x 10(-10) x (T-react/300)(-2.5) in the reaction temperature range of T-react = 114-187 K. The H3O+ and C2H2 radiative association reaction is found to have a rate coefficient below 1 x 10(-1)3 cm(3).s(-1) at 187 K. This result is consistent with Herbst's experimental determination.