Answer
$N{H_2}^-$ and $N{H_4}^+$ aren't a conjugate acid-base pair.
Work Step by Step
- Fast method:
A conjugate acid-base pair has exactly one $H^+$ as a difference. So, this isn't a valid pair.
- Other method:
1. Identify the base:
- $N{H_2}^-$
2. Add a $H^+$ to it:
- $NH_3$
Compare with the other substance:
$N{H_3} \ne N{H_4}^+$
- So, this isn't a conjugate acid-base pair.
