To solve the problem, we need to identify the ion produced by bases in water.
1. Understanding the Behavior of Bases:
Bases are substances that release hydroxide ions ($OH^-$) when dissolved in water. For example, sodium hydroxide (NaOH) dissociates in water to form $OH^-$ ions.
2. Identifying the Ion Released by Bases:
When a base dissolves in water, it gives $OH^-$ ions, which are responsible for its basic nature.
Final Answer:
Bases can give $ {OH^-} $ ions in water.