Question

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●Why is aqueous ammonia considered as a base even though it doesn't contain OH- ions?​

Answer 1

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Ammonia instead of not having hydroxyl group is a base because it forms OH- ions when added to water as it ionises to form ammonium ions and hydroxide ions after forming ammonium hydroxide when mixed in water.

Ammonia is a base but doesn’t contain any hydroxyl group because it forms OH- ions when it is added to water.

EXPLANATION:

In water, ammonia forms ammonium hydroxide. While adding water, ammonia ionises for forming the ions of ammonium and hydroxide ions.  

In water, ammonia accepts the protons which are provided by dissociation of water. Water in this case which acts as an ‘acid’ and since ammonia accepts these protons, which it acts as a ‘base’.

Weak bases. Ammonia is a typical weak base. Ammonia itself obviously doesn't contain hydroxide ions, but it reacts with water to produce ammonium ions and hydroxide ions.