The reaction between bromide and bromate ions in acid solution is a slow chemical reaction at room temperature. This may be due to the high activation energy of the reaction, which required 56.676 kJ of energy in order for a reaction to take place. According to collision theory, high activation energy will cause the product more difficult to form since it is not sufficient energy for that molecule collide without enough energy. Any reaction cannot occur if the colliding molecules do not have the energy equal or higher than its activation energy. There are also other factors that can reduce the effectiveness of collisions of molecules such as present or absent of catalyst.
According to Table 1, we can observed that the higher the temperature of the reactant species, the shorter the time taken for the disappearance of red colour of methyl red indicator. This is shows that shorter time taken in the reaction once the reaction is faster and higher rate of reaction. Although the activation energy for the reaction to occur remains unchanged at all the temperature, but the rate of reaction increased as the temperature increased. This means that the rate of reaction is depends on the temperature of the reactant. This has also been proven in Arrhenius equation where rate constant, log10 k is proportionally to 1/T with the slope of the graph, -Ea/R and a constant of log10 A.