Solution of ammonia is a weak alkali. why?

The aqueous solution of ammonia is weak alkali because ammonia produces OH- ions in it's water solution. - Initially ammonia doesn't have any kind of OH- or hydroxyl ions. Due to the presence of OH- or hydroxyl ions in the solution,the aqueous solution of ammonia is considered as a weak alkali.

your answer is

The aqueous solution of ammonia is weak alkali because ammonia produces OH- ions in it's water solution. - Initially ammonia doesn't have any kind of OH- or hydroxyl ions. Due to the presence of OH- or hydroxyl ions in the solution,the aqueous solution of ammonia is considered as a weak alkali.
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Explanation:

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