Here's why:

* NaOH is a strong base: It readily dissociates in water, forming sodium ions (Na+) and hydroxide ions (OH-).

* Solubility increases with temperature: While NaOH is very soluble at room temperature, its solubility increases significantly as the water temperature rises.

However, there are some practical limitations:

* Saturation point: Even though NaOH is highly soluble, there is a limit to how much can dissolve in a given amount of water at a specific temperature. This is known as the saturation point. Beyond this point, any additional NaOH will not dissolve.

* Exothermic reaction: Dissolving NaOH in water is an exothermic reaction, meaning it releases heat. If you add too much NaOH, the solution can become very hot, potentially causing hazards.

Therefore, while excess NaOH can be dissolved in water, it's important to consider the saturation point and safety precautions when handling large quantities.