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Properties of substance:
ammonium hydrogen difluoride
Synonyms:
ammonium bifluoride
ammonium hydrogen fluoride
Group of substances:
inorganic
Physical appearance:
colorless rhombic crystals
Empirical formula (Hill's system for organic substances):
H
5
F
2
N
Structural formula as text:
NH4HF2
Molar/atomic mass: 57.043
Melting point (°C):
126.45
Boiling point (°C):
238
CAS №: 1341-49-7
Solubility (g/100 g of solvent):
acetone
: 0.04 (25°C) [
Ref.
]
dichloroacetic acid
: 1.83 (25°C) [
Ref.
]
dimethylsulfoxide
: 0.06 (25°C) [
Ref.
]
ethanol
: 0.04 (25°C) [
Ref.
]
ethanol 90%
: 1.76 (25°C) [
Ref.
]
hydrogen fluoride
: very soluble [
Ref.
]
methanol
: 0.04 (25°C) [
Ref.
]
water
: 60.2 (20°C) [
Ref.
]
water
: 69.7 (25°C) [
Ref.
]
Hygroscopic:
yes
Density:
1.5 (25°C, g/cm
3
)
Reactions:
[
Ref.1
,
Ref.2
]
2NH
4
HF
2
+ H
3
BO
3
→ NH
4
BF
4
+ NH
3
+ 3H
2
O
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
-799 (s)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
115.5 (s)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
106.7 (s)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
19.096
LD
50
(mg/kg):
60 (rats, oral)
50 (guinea pig, oral)
70 (mice, oral)
References:
CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 4-47
Milne G.W.A. Gardner's Commercially Important Chemicals. - Wiley-Interscience, 2005. - pp. 32
Patnaik P. Handbook of inorganic chemicals. - McGraw-Hill, 2003. - pp. 26-28
Perry D.L. Handbook of Inorganic Compounds. - 2nd ed. - CRC Press, 2011. - pp. 26
Ефимов А.И. и др. Свойства неорганических соединений. Справочник. - Л.: Химия, 1983. - pp. 100-101 [Russian]
Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 28-29 [Russian]
Успехи химии. - 1984. - Т.53, №9. - pp. 1463-1492 [Russian]
Фториды аммония. - М., 1988. - pp. 28-53 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru
, Ref.2]
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