Answer
A $[CH_3NH_3]NO_3 $ solution will be acidic.
Work Step by Step
1. Identify the strength of each ion in the salt:
$CH_3N{H_3}^+$: Weak acidity.
- Since $CH_3N{H_3}^+$ is the conjugate acid of a weak base $CH_3NH_2$, it has a weak acidity.
$N{O_3}^-$: Insignificant basicity:
- Since $N{O_3}^-$ is the conjugate base of a strong acid: $HNO_3$, it has a negligible basicity.
Therefore, since the stronger ion is an acid, the solution will be acidic.