20mL of an 85mM solution of m-cresol, a monoprotic acid (pK_a= 10.1) is neutralised by the addition of 15mL of a 140mM solution of potassium hydroxide. When using phenolphthalein as an indicator (pK_a= 9.4), a complete colour change was noted after 37 seconds of mixing the two solutions, when the reaction was conducted at 16°C. Using similar reagent quantities at 41°C, this colour change completed after only 24 seconds. Determine the apparent activation energy associated with this neutralisation.