weak base

A weak base is a substance that can accept hydrogen ions (protons) from acids, but it does so only partially or less readily compared to strong bases. In solution, it doesn't completely turn into its ionic form, resulting in a lower pH change than strong bases. Examples include ammonia and its compounds. Weak bases are important in chemistry and biology because they help regulate pH levels and participate in various biochemical reactions, acting as buffers that maintain system stability without causing drastic pH shifts.