By the Arrhenius definition of an acid and base, alcohol is neither acidic nor basic when dissolved in water, as it neither produces H+ nor OH- in solution. They are generally weak acids. Alcohols are very weak Brønsted acids with pKa values generally in the range of 15 – 20. Alcohol is amphoteric in nature i.e both acid and base. It gives H+ or OH- depending on attacking species.