Question

Ammonium hydroxide is a weak alkali.
(A) True
(B) False

Answer 1

Hint:
In this question, the chemical formula of ammonium hydroxide is $N{H_4}OH$ in which this is a weakly basic compound. In the$N{H_4}OH$, the ammonia dissolves in water and that present only in these solutions.
So here alkali is known as a base that dissolves in water. The pH of a soluble base is greater than $7$ in a solution. Weak Alkali is defined as it dissociates partially to form OH – ions.


Complete step by step answer:
In this Question, Ammonium hydroxide ($N{H_4}OH$) is called a weak alkali because it is soluble in water & the pH of ammonium hydroxide is in between $7 - 10$ & $N{H_4}OH$ is not completely dissociated into ions.
Ammonium hydroxide is also a weak base that does not ionize completely in the given aqueous solution. Then, the Bronsted-Lowry concept, it states that weak base is defined as a compound which is $N{H_4}OH$ with incomplete protonation.
As Comparison strong Base, the low pH relatively shows by a weak base. Complete ionization does not occur in the ammonium hydroxide that is
$N{H_4}OH \to NH_4^ + + O{H^ - }$
Typically, the Ammonia is a weak base because in the ammonium hydroxide, ammonia does not contain hydroxide ions by itself but when it reacts with water in the solution then it produces ammonium ions & hydroxide ions in the aqueous solution.
Additional Information: There are interesting information about ammonium hydroxide ($N{H_4}OH$) are present as \[N{H_3}\]and \[{H_2}O\] or either as \[NH_4^ + + O{H^ - }\].These both are involved in a reversible reaction; it reaches to equilibrium as compared to \[NH_4^ + \] and \[O{H^ - }\] there is high chances for the presence of \[N{H_3}\] and\[{H_2}O\]. Hence as a result the concentration \[O{H^ - }\] is decreased. So, the ammonium hydroxide has been considered a weak alkali. It also has strong conjugate acid.

Note:
Ammonium Hydroxide are used in many industries for cleaning the surface as cleaner. It is also called a cleaning agent. In different household work, it is used as Sanitizer.