According to one acid-base theory, NH3 acts as a base when an NH3 molecule

A) accepts an H+ion

B) donates an H + ion

C) accepts an OH-ion

D) donates an OH - ion

According to the acid-base theory, base in a molecule that accepts a proton (H⁺ ion), while acid gives a proton (H⁺ ion).

Because NH₃ is a base it will accept H⁺ ion, as shown in the equation:

NH₃ + H⁺ → NH₄⁺

The correct answer is A) accepts an H⁺ ion.