At 28 oC, raw milk sours in 4 h but takes 50 h to sour in a refrigerator at 5 oC.
Estimate the activation energy in kJ/mol for the reaction that leads to the souring of milk.
We are asked to calculate for the activation energy of a chemical reaction given with two temperatures and two reaction times.
The equation that connects two given temperatures and two reaction times with the activation energy is the two-point form of the Arrhenius equation:
where: k1 is the rate of first reaction
k2 is the rate of second reaction
Ea is the activation energy
R is the gas constant
T1 is the temperature for the first reaction
T2 is the temperature of the second reaction