If the following substance is dissolved in pure water, will the solution be acidic, neutral, or basic? solid ammonium fluoride (NH₄F)
For NH₃, K_b = 1.8 × 10^-5; for HF, K_a = 7.2 × 10^-4.

Question

Quizplus · Accepted Answer

Ammonium fluoride (NH4F) is a salt that can dissociate in water to form ammonium ions (NH4+) and fluoride ions (F-). Ammonium ions can hydrolyze in water to form hydronium ions (H3O+) and ammonia (NH3):
NH4+ + H2O → H3O+ + NH3
NH3 can act as a base and react with water to produce hydroxide ions (OH-):
NH3 + H2O → NH4+ + OH-
Fluoride ions can react with water to produce hydrofluoric acid (HF):
F- + H2O → HF + OH-
Therefore, the solution will be acidic, as NH4+ can hydrolyze to produce H3O+ and there will be a small amount of HF formed from the reaction between F- and water.

If the Following Substance Is Dissolved in Pure Water, Will