Ammonium fluoride

• Ammonium fluoride
• Ammonium fluoride

White, deliquescent crystals

Fixed

1.01 g · cm -3

Decomposition above 100 ° C.

Well in water (820 g · l-1 at 20 ° C)

Risk

1 mg · m -3 ( inhalable aerosol fraction)

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Ammonium fluoride ammonium salt of hydrogen fluoride.

Properties

Ammonium fluoride is colorless, slightly deliquescent, easily soluble in water and is toxic crystals.

Reactions

When heated, it decomposes into ammonia and hydrogen fluoride:

Synthesis

The preparation of ammonium fluoride is carried out by neutralization of aqueous ammonia solution with hydrofluoric acid, followed by crystallization from water.

Another synthetic route is the heating of ammonium chloride, sodium fluoride, wherein the product removed by sublimation:

Precautions

Ammonium fluoride is toxic. Avoid contact with skin and eyes. Contact with strong acids, hydrogen fluoride is released. This is extremely toxic and highly corrosive.

Disposal

Dissolved fluoride as calcium fluoride precipitate.