Question

What is the concentration of ammonium ion in a 0.25M solution of ammonium chloride?
A. 0.13 M
B. 0.25 M
C. 0.50 M
D. 0.75 M
E. 1.00 M

Answer 1

To solve this question firstly you have to write the reaction of ammonium chlorine to form ammonium ion and chlorine ion and it is given as $N{{H}_{4}}Cl\to NH_{4}^{+}+C{{l}^{-}}$. Ammonium chlorine is a type of salt and is a strong electrolyte. Concentration of ammonium chloride and ammonium ion will be the same.

Complete answer:
From your chemistry lessons you have learned about the ammonium chloride and its reaction to form the product of ammonium ion and the chloride ion.
Ammonium chloride is a type of an inorganic compound with the structure of $N{{H}_{4}}Cl$ and it is a white crystalline salt which is highly soluble in the water. Ammonium chloride solution is somewhat slightly acidic in nature. It is formed of ammonium ion and chloride ions. It is a colorless type of chemical compound.
The reaction of breakdown of ammonium chloride into ammonium ion is given as:
$N{{H}_{4}}Cl\to NH_{4}^{+}+C{{l}^{-}}$
Now, in the question the concentration of ammonium chloride solution is given as 0.25M. And as we know that the ammonium chloride is a type of salt and also a strong electrolyte.
Therefore the concentration of ammonium chloride will be equal to the concentration of ammonium ion and chlorine ion and it is given as:
$\left[ NH_{4}^{+} \right]=\left[ N{{H}_{4}}Cl \right]=0.25M$
Hence the concentration of ammonium ion in a 0.25M solution of ammonium chloride is also 0.25M.

Thus the correct option will be (B).

Note:
Strong electrolyte is defined as the solute/solution which is completely or almost completely ionized or tends to dissociate in the solution. The ion in the solution behaves as the good conductor of electricity. Ammonium chloride has many applications such as it is used as a fertilizer , medicine and also as a food.