Final answer:
A solution where NH₃ is less than 100% ionized is classified as a weak base.
Step-by-step explanation:
In chemistry, a solution where NH₃ is less than 100% ionized is classified as a weak base.
A weak base is a base that ionizes only slightly in an aqueous solution. For example, when ammonia (NH₃) is dissolved in water, only about 0.42% of the dissolved ammonia molecules dissociate into ammonium ions and hydroxide ions. The majority of the molecules remain neutral.
Strong bases, on the other hand, are 100% ionized in solution. They are typically OH compounds. NH₃ does not contain OH ions as part of its formula, so it is considered a weak base.