Ammonium Bifluoride CAS 1341-49-7 Ammonium hydrogen difluoride

Place of Origin: Shandong,China (Mainland)
Brand Name: MOSINTER
CAS No.: 1341-49-7
Molecular formula: F2H5N
Molecular weight: 57.04
Melting Point: 125 °C(lit.)
Boiling point: 230 °C
Flashing point: 238°C
Density: 1,5 g/cm3
Soluble: 630 g/L (20 ºC)
Sensibility: Hygroscopic

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Product Description

Payment & Shipping Terms Supply Capacity
Payment Terms:L/C, T/T, WUProduction Capacity:5000 Ton/Year
Min. Order:500 KilogramPacking:According to the...
Means of Transport:Ocean, Air, LandDelivery Date:within 7 days

Ammonium Bifluoride (CAS: 1341-49-7)

 

Item

Index

Appearance

White Orthorhombic Crystal

NH4HF2, %≥

98.0

loss on drying, %≤

1.0

Content of residue on ignition, %≤

0.2

Sulfate(base on SO4) content, %≤

0.1

Content of ammonium fluosilicate [(NH4)SiF6]   , %≤

2.0

Ammonium hydrogen fluoride is the inorganic compound with the formula NH4HF2 or NH4F·HF. It is produced from ammonia and hydrogen fluoride. This colourless salt is a glass-etchant and an intermediate in a once-contemplated route to hydrofluoric acid.


Structure

Ammonium bifluoride, as its name indicates, contains a bifluoride, or hydrogen(difluoride) anion: HF2−. This centrosymmetric triatomic anion features the strongest known hydrogen bond, with a F−H length of 114 pm.  and a bond energy greater than 155 kJ mol−1.

In solid [NH4][HF2], each ammonium cation is surrounded by four fluoride centers in a tetrahedron, with hydrogen-fluorine hydrogen bonds present between the hydrogen atoms of the ammonium ion and the fluorine atoms. Solutions contain tetrahedral [NH4]+ cations and linear [HF2]− anions.


Production and applications

Ammonium bifluoride is a component of some etchants. It attacks silica component of glass:

SiO2 + 4 [NH4][HF2] → SiF4 + 4 [NH4]F + 2 H2O

Potassium bifluoride is a related more commonly used etchant.

Ammonium bifluoride has been considered as an intermediate in the production of hydrofluoric acid from hexafluorosilicic acid. Thus, hexafluorosilicic acid is hydrolyzed to give ammonium fluoride, which thermally decomposes to give the bifluoride:

H2SiF6 + 6 NH3 + 2 H2O → SiO2 + 6 NH4F

2 NH4F → NH3 + [NH4]HF2

The resulting ammonium bifluoride is converted to the sodium bifluoride, which thermally decomposes to release HF.

Category: Other Chemical Products


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