When acids and bases dissolve in water, they undergo ionization, which is the process of dissociation into ions. The specific ions that are formed depend on the nature of the acid or base. Here's a general overview:

Acids:

- Strong acids, such as hydrochloric acid (HCl) and sulfuric acid (H2SO4), completely dissociate in water, releasing hydrogen ions (H+) and the corresponding anions. For example:

```

HCl(aq) → H+(aq) + Cl-(aq)

```

- Weak acids, such as acetic acid (CH3COOH), partially dissociate in water, establishing an equilibrium between the undissociated acid and the ions. For example:

```

CH3COOH(aq) ⇌ H+(aq) + CH3COO-(aq)

```

Bases:

- Strong bases, such as sodium hydroxide (NaOH) and potassium hydroxide (KOH), completely dissociate in water, releasing hydroxide ions (OH-) and the corresponding cations. For example:

```

NaOH(aq) → Na+(aq) + OH-(aq)

```

- Weak bases, such as ammonia (NH3), partially dissociate in water, establishing an equilibrium between the undissociated base and the ions. For example:

```

NH3(aq) + H2O(l) ⇌ NH4+(aq) + OH-(aq)

```

In summary, acids release H+ ions when dissolved in water, while bases release OH- ions. The strength of an acid or base determines the extent of ionization and the concentration of the resulting ions in solution.