Here's why:

* pH Scale: The pH scale measures the acidity or alkalinity of a solution. It ranges from 0 to 14.

* Acids: Acids have a pH less than 7.

* Neutral: A neutral solution has a pH of 7.

* Alkalis (Bases): Alkalis or bases have a pH greater than 7.

Weak alkalis are those that only partially ionize in solution, meaning they don't release all of their hydroxide ions (OH-) into the solution. This results in a lower concentration of OH- compared to strong alkalis, leading to a pH closer to 7.

Examples of weak alkalis:

* Ammonia (NH3)

* Sodium bicarbonate (NaHCO3)

* Magnesium hydroxide (Mg(OH)2)

Important Note: The exact pH of a weak alkali will depend on its concentration and the specific compound.