# Why are ketones acidic?

I have found various sources saying that ketones are acidic (pKa=20), and then relate it to the formation of the enolate ion. However, isn't an enolate ion of a ketone basic due to the oxygen's negative charge and all the pairs of electrons surrounding it?

• If an acid loses its proton, it becomes a base and thus basic. – Jan Jul 3 '16 at 18:37