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Properties of substance:
hydrogen bromide
Group of substances:
inorganic
Physical appearance:
colorless gas
Empirical formula (Hill's system for organic substances):
HBr
Structural formula as text:
HBr
Molar/atomic mass: 80.91
Melting point (°C):
-86.9
Boiling point (°C):
-66.8
Solubility (g/100 g of solvent):
ethanol
: soluble [
Ref.
]
hydrogen fluoride
: insoluble [
Ref.
]
water
: 247.3 (-20°C) [
Ref.
]
water
: 239 (-15°C) [
Ref.
]
water
: 221.2 (0°C) [
Ref.
]
water
: 210.3 (10°C) [
Ref.
]
water
: 193 (25°C) [
Ref.
]
water
: 171.5 (50°C) [
Ref.
]
water
: 150.5 (75°C) [
Ref.
]
water
: 130 (100°C) [
Ref.
]
Properties of solutions:
1% (wt.), solvent - water
Density (g/cm
3
) = 1.0053 (20°)
2% (wt.), solvent - water
Density (g/cm
3
) = 1.0124 (20°)
10% (wt.), solvent - water
Density (g/cm
3
) = 1.0723 (20°)
Electrical Conductivity (mS/cm) = 354.9 (15°)
15% (wt.), solvent - water
Electrical Conductivity (mS/cm) = 494. (15°)
20% (wt.), solvent - water
Density (g/cm
3
) = 1.1579 (20°)
30% (wt.), solvent - water
Density (g/cm
3
) = 1.258 (20°)
39,4% (wt.), solvent - water
Freezing point (°C) = -89.6
40% (wt.), solvent - water
Density (g/cm
3
) = 1.3772 (20°)
45% (wt.), solvent - water
Density (g/cm
3
) = 1.4446 (20°)
50% (wt.), solvent - water
Density (g/cm
3
) = 1.5173 (20°)
60% (wt.), solvent - water
Density (g/cm
3
) = 1.6787 (20°)
65% (wt.), solvent - water
Density (g/cm
3
) = 1.7675 (20°)
Numerical data:
Polarizability of molecules (nm
3
): 0.0036
Density:
0.003645 (20°C, g/cm
3
)
Reactions of synthesis:
Yeild 94%. [
Ref.1
]
C
10
H
12
+ 4Br
2
→ C
10
H
8
Br
4
+ 4HBr
[
Ref.1
]
H
2
+ Br
2
→ 2HBr
[
Ref.1
]
2KBr + H
2
SO
4
→ 2HBr + K
2
SO
4
Reactions:
Yeild 89%. [
Ref.1
]
CH
3
(CH
2
)
3
C≡CH + HBr → CH
3
(CH
2
)
3
CBr=CH
2
Yeild 91%. [
Ref.1
]
HOCH
2
C≡CH + HBr → HOCH
2
CBr=CH
2
[
Ref.1
]
Si + 3HBr → SiHBr
3
+ H
2
[
Ref.1
]
SOCl
2
+ 2HBr → SOBr
2
+ 2HCl
[
Ref.1
]
CrO
2
Cl
2
+ 2HBr → CrO
2
Br
2
+ 2HCl
Dissociation:
H
0
(1) = -10 (25°C)
H
0
(1) = -4.85 (25°C, water)
pK
a
(1) = -9 (25°C, water)
pK
a
(1) = 5.6 (25°C, acetic acid)
Permittivity (dielectric constant):
6.3 (-80°C)
1.0028 (21°C)
Dipole moment (D):
0.79 (20°C)
Speed sound (m/s):
200 (0°C, aggregative state - gas)
Standard molar enthalpy (heat) of formation Δ
f
H
0
(298.15 K, kJ/mol):
-34.1 (g)
Standard molar Gibbs energy of formation Δ
f
G
0
(298.15 K, kJ/mol):
-51.2 (g)
Standard molar entropy S
0
(298.15 K, J/(mol·K)):
198.6 (g)
Molar heat capacity at constant pressure C
p
(298.15 K, J/(mol·K)):
28.01 (g)
Molar enthalpy (heat) of fusion Δ
fus
H (kJ/mol):
2.41
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol):
17.61
Enthalpy (heat) of vaporization Δ
vap
H (kJ/mol)
12.69 (l) [25°C] [
Ref.
]
Critical temperature (°C):
89.8
Critical pressure (MPa):
8.51
Critical density (g/cm
3
):
0.807
References:
Comey A. M., Hahn D. A. A dictionary of Chemical Solubilities Inorganic. - 2 ed. - New York, The MacMillan Company, 1921. - pp. 114-115
Inorganic Syntheses. - Vol. 1. - New York and London, 1939. - pp. 149-157
Olah G.A., Prakash G.K.S., Molnar A., Sommer J. Superacid chemistry. - 2ed. - Wiley, 2009. - pp. 62
Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 568-569
Девятых Г.Г., Зорин А.Д. Летучие неорганические гидриды особой чистоты. - М.: Наука, 1974. - pp. 179-190 [Russian]
Неводные растворители. - М.: Химия, 1971. - pp. 81 [Russian]
Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 57 [Russian]
Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 345 [Russian]
Справочник по растворимости. - Т.1, Кн.2. - М.-Л.: ИАН СССР, 1962. - pp. 996-998 [Russian]
Справочник химика. - Т. 3. - М.-Л.: Химия, 1965. - pp. 78 [Russian]
Справочник химика. - Т. 3. - М.-Л.: Химия, 1965. - pp. 367, 452-453 [Russian]
Успехи химии. - 1966. - Т.35, №11. - pp. 1937 [Russian]
Химическая энциклопедия. - Т. 1. - М.: Советская энциклопедия, 1988. - pp. 320 [Russian]
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© Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru