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

Question

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

Answer 1

Solution

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.