when you hydrolyze this salt, both nh4+ and ch3coo- will hydrolyzed
ka value of ch3cooh is 1.8×10^-5
kb values of nh4oh is 1.8×10^-5 too
the basic principle is, for a salt that fully hydrolyzed, if the ka value of acid ion is larger than the kb value of basic ion, the salt is acidic, and vice versa
but when the ka value and the kb value is equal, then the salt is neutral
since the ka value of ch3coo- and the kb value of nh4+ is the same, this salt is neutral
hope this helps..
It is Acidic 🙂