1. Ka for hydrofluoric acid = 6.4 x 10-5 Kb for ammonia = 1.8x10-5 This isnt tough, let us firstly calculate their pK values. It is soluble in water. Ammonium fluoride is the inorganic compound with the formula NH4F. (Some websites give poor advice on this problem). For HF Ammonium fluoride is soluble in water. KF is highly soluble in water. However, the F- further hydrolyzes with water to form HF. It initially dissociates into K+ and F-. Is ammonium fluoride acidic, or basic? Write the formula unit equation for this reaction occurring in water: Ammonium fluoride and magnesium chloride are mixed to form magnesium fluoride and ammonium chloride. Hydrogen Fluoride, Hydrofluoric Acid, Ammonium Fluoride, and Ammonium Bifluoride Alternative Names HF HF is a water-soluble gas that forms hydrofluoric acid when dissolved in … Ammonium fluoride is a white crystalline solid. … In water, F It crystallizes as small colourless prisms, having a sharp saline taste, and is highly soluble in water. Ammonium fluoride is corrosive to aluminum. Unlike other halide ions, the fluoride ion is quite reactive, acting as a weak base and … Solubility in fluorine hydride, water, acetone, ammonia liquid, dimethyl sulfoxide, methanol, ethanol, . Ammonium fluoride reacts with water to form hydrofluoric acid, a source of fluoride ions. Since HF is a weak acid (pKa = 3.17), it would rather exist as molecular HF than ionic F-. More information about Ammonium fluoride (NH4F). Ammonium fluoride is used in chemical analysis, in brewing, and as a preservative for wood. Ammonium fluoride is noncombustible.