Chapter 19, Problem 3STP

Interpretation Introduction

Interpretation : The conjugate base of the ammonium ion is to be identified.

Concept Introduction : The adjective conjugate is used to differentiate the reactants from the products of the forward reaction. This word's root is a Latin verb that means "to connect together."

Answer to Problem 3STP

Correct answer: Option (C)

  ${\text{NH}}_3$ is the conjugate base of the ammonium ion.

Explanation of Solution

Reason for correct option:

An ion or molecule that is left over after an acid loses a hydrogen ion is known as a conjugate base.

The given compound is ${\text{NH}}_4^{+}$ .

The ammonium ion loses a hydrogen ion which is given below:

  ${\text{NH}}_4^{+}\to {\text{H}}^{+}+{\text{NH}}_3$

  ${\text{NH}}_3$ is the conjugate base since it is one left over after losing a hydrogen ion.

The name of it is ammonia.

So, option (C) is the correct answer.

Conclusion

Reasons for incorrect options:

Options (A), (B), (D): All these options are irrelevant since ammonium ion does not contain oxygen in it to give such conjugate base.