Question

why ammonia is consider weak base due to formation of OH^-ions in its aqueous solution?

Answer 1

Answer:

Ammonia is a weak base because its nitrogen atom has an electron pair that readily accepts a proton. Also, when dissolved in water, ammonia acquires hydrogen ions from water to produce hydroxide and ammonium ions. It is the production of these hydroxide ions that imparts ammonia its characteristic basicity.

Answer 2

Answer:

For a substance to be classified as an Arrhenius base, it must produce hydroxide ions in an aqueous solution. Arrhenius believed that in order to do so, the base must contain hydroxide in the formula. ... In this reaction ammonia is the base because it accepts a proton from the water molecule.