Why pure water is not acidic at 318k?

At 318K, pure water is not acidic because the self-ionization of water is relatively low at this temperature. The self-ionization of water involves the transfer of protons (H+) between water molecules to form hydronium ions (H3O+) and hydroxide ions (OH-). At 318K, the concentration of hydronium and hydroxide ions in pure water is equal, resulting in a neutral pH. If the temperature were to increase, the self-ionization of water would also increase, leading to a slightly acidic pH due to the formation of more hydronium ions.