Question

What are the donors in a hydronium ion and ammonium ion?

Answer 1

Hydronium ion $[H_{3}O{]}^{+}$

Ammonium ion $[N{H}_4{]}^{+}$

These ions are Bronsted acids because they are capable of doating a proton ($H^{+}$). The bases attack these ions and take ($H^{+}$)