Question

Hf is a stronger acid than nh+ 4 . which base would be stronger: f− or nh3? 1. f − 2. both bases would be equal in strength. 3. nh3 4. cannot tell from the information given. 5. neither f1− nor nh3 would be bases.

Answer 1

The correct answer is 3. NH3. According to Bronsted and Lowry an acid is defined as a proton donor and a base as a proton acceptor. A strong bases are better H+ acceptors than weak bases while strong acids are better proton (H+) donors than weak acids. In this case NH3 is a better base than F- because it accepts the ion more readily than F-.