Chemistry question about solutions (acid and basic)

Question

What ultimately occurs in the ionization process of a weak acid or base?

1. It eventually reverses completely to reform the un-ionized acid or base molecules
2. It eventually goes 100% to completion.
3. It eventually decomposes water to H₂ and O₂.
4. It eventually gets neutralized and loses its chemical activity.
5. It eventually reaches a dynamic equilibrium with the reverse process.

Answer 1

1. It eventually reaches a dynamic equilibrium with the reverse process.

Let HA be the weak acid. When in water, it dissociates as follows..

HA <===> H⁺ + A^-