Another reason for the resulting relationship between temperature and concentration being more linear is the solvent of acetylsalicylic acid, ethanol. Ethanol is a highly volatile substance, which results in it evaporating at a fast rate, especially as the temperature increases and provides it with more energy to change state. At higher temperatures, this fast evaporation of ethanol could have resulted in some of the acetylsalicylic acid being left undissolved, therefore not undergoing hydrolysis, and not producing the maximum yield of salicylic acid to react with iron (III) nitrate. This would again result in the concentration not demonstrating exponential growth as the temperature increases. If this issue were to be prevented by lowering the temperatures of the solutions, the previous source of error would be heightened.