Sodium Bromide Dihydrate Is Correctly Written Assignments

Names
IUPAC name

Sodium bromide

Identifiers

CAS Number

3D model (JSmol)

ChEMBL
ChemSpider
ECHA InfoCard100.028.727

PubChemCID

RTECS numberVZ3150000
UNII

InChI

  • InChI=1S/BrH.Na/h1H;/q;+1/p-1 Y
    Key: JHJLBTNAGRQEKS-UHFFFAOYSA-M Y
  • InChI=1/BrH.Na/h1H;/q;+1/p-1

    Key: JHJLBTNAGRQEKS-REWHXWOFAR

Properties

Chemical formula

BrNa
Molar mass102.89 g·mol−1
AppearanceWhite powder, hygroscopic
Density3.21 g/cm3 (anhydrous)
2.18 g/cm3 (dihydrate)
Melting point747 °C (1,377 °F; 1,020 K)
(anhydrous)
36 °C (97 °F; 309 K)
(dihydrate) decomposes[1]
Boiling point1,390 °C (2,530 °F; 1,660 K) [1]

Solubility in water

71.35 g/100 mL (−20 °C)
79.52 g/100 mL (0 °C)
94.32 g/100 mL (25 °C)[2]
104.9 g/100 mL (40 °C)
116.2 g/100 mL (100 °C)[3]
SolubilitySoluble in alcohol, liquid ammonia, pyridine, hydrazine, SO2, amine
Insoluble in acetone, acetonitrile[2]
Solubility in methanol17.3 g/100 g (0 °C)
16.8 g/100 g (20 °C)
16.1 g/100 g (40 °C)
15.3 g/100 g (60 °C)[2]
Solubility in ethanol2.45 g/100 g (0 °C)
2.32 g/100 g (20 °C)
2.29 g/100 g (30 °C)
2.35 g/100 g (70 °C)[2]
Solubility in formic acid19.3 g/100 g (18 °C)
19.4 g/100 g (25 °C)[2]
Solubility in glycerol38.7 g/100 g (20 °C)[2]
Solubility in dimethylformamide3.2 g/100 g (10.3 °C)[2]
Vapor pressure1 torr (806 °C)
5 torr (903 °C)[1]

Magnetic susceptibility (χ)

−41.0·10−6 cm3/mol
Thermal conductivity5.6 W/m·K (150 K)[4]

Refractive index (nD)

1.6428 (24 °C)
nKrF = 1.8467 (24 °C)
nHe–Ne = 1.6389 (24 °C)[5]
Viscosity1.42 cP (762 °C)
1.08 cP (857 °C)
0.96 cP (937 °C)[2]
Structure

Crystal structure

Cubic

Lattice constant

a = 5.97 Å[4]

Thermochemistry

Specific
heat capacity (C)

51.4 J/mol·K[2]

Std molar
entropy (S298)

86.82 J/mol·K[2]

Std enthalpy of
formation (ΔfH298)

−361.41 kJ/mol[2]

Gibbs free energy (ΔfG˚)

−349.3 kJ/mol[2]
Hazards
Safety data sheetExternal MSDS
R-phrases(outdated)R36
S-phrases(outdated)(S2), S24/25, S46
NFPA 704
Flash point800 °C (1,470 °F; 1,070 K)
Lethal dose or concentration (LD, LC):

LD50 (median dose)

3500 mg/kg (rats, oral)
Related compounds

Other anions

Sodium fluoride
Sodium chloride
Sodium iodide
Sodium astatide

Other cations

Lithium bromide
Potassium bromide
Rubidium bromide
Caesium bromide
Francium bromide

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

N verify (what is YN ?)
Infobox references

Sodium bromide is an inorganic compound with the formula NaBr. It is a high-melting white, crystalline solid that resembles sodium chloride. It is a widely used source of the bromide ion and has many applications.[7]

Synthesis, structure, reactions[edit]

NaBr crystallizes in the same cubic motif as NaCl, NaF and NaI. The anhydrous salt crystallizes above 50.7 °C.[7]Dihydrate salts (NaBr·2H2O) crystallize out of water solution below 50.7 °C.[8]

NaBr is produced by treating sodium hydroxide with hydrogen bromide.

Sodium bromide can be used as a source of the chemical elementbromine. This can be accomplished by treating an aqueous solution of NaBr with chlorine gas:

2 NaBr + Cl2 → Br2 + 2 NaCl

Applications[edit]

Sodium bromide is the most useful inorganic bromide in industry.[7] It is also used as a catalyst in TEMPO-mediated oxidation reactions.[9]

Medicine[edit]

See also: Potassium bromide § Medical and Veterinary

Also known as Sedoneural, sodium bromide has been used as a hypnotic, anticonvulsant, and sedative in medicine, widely used as an anticonvulsant and a sedative in the late 19th and early 20th centuries. Its action is due to the bromide ion, and for this reason potassium bromide is equally effective. In 1975, bromides were removed from drugs in the U.S. such as Bromo-Seltzer due to toxicity.[10]

Preparation of other bromine compounds[edit]

Sodium bromide is widely used for the preparation of other bromides in organic synthesis and other areas. It is a source of the bromide nucleophile to convert alkyl chlorides to more reactive alkyl bromides by the Finkelstein reaction:

NaBr + RCl → RBr + NaCl (R = alkyl)

Once a large need in photography, but now shrinking, the photosensitive salt silver bromide is prepared using NaBr.

Disinfectant[edit]

Sodium bromide is used in conjunction with chlorine as a disinfectant for hot tubs and swimming pools.

Petroleum industry[edit]

Sodium bromide is used to prepare dense fluids used in oil wells.

Safety[edit]

NaBr has a very low toxicity with an oral LD50 estimated at 3.5 g/kg for rats.[6] However, this is a single-dose value. Bromide ion is a cumulative toxin with a relatively long half life (in excess of a week in humans): see potassium bromide.

References[edit]

External links[edit]

  1. ^ abcPradyot, Patnaik (2003). Handbook of Inorganic Chemicals. The McGraw-Hill Companies, Inc. ISBN 0-07-049439-8. 
  2. ^ abcdefghijklhttp://chemister.ru/Database/properties-en.php?dbid=1&id=714
  3. ^Seidell, Atherton; Linke, William F. (1919). Solubilities of Inorganic and Organic Compounds (2nd ed.). D. Van Nostrand Company. 
  4. ^ ab"Sodium Bromide (NaBr)". korth.de. Korth Kristalle GmbH. Retrieved 2014-06-11. 
  5. ^Polyanskiy, Mikhail. "Refractive index of NaBr (Sodium bromide) - Li". refractiveindex.info. Retrieved 2014-06-11. 
  6. ^ ab"Sodium bromide MSDS"(PDF). sciencelab.com. Sciencelab.com, Inc. 2013-05-21. Retrieved 2014-06-11. 
  7. ^ abcMichael J. Dagani, Henry J. Barda, Theodore J. Benya, David C. Sanders "Bromine Compounds" in Ullmann's Encyclopedia of Industrial Chemistry Wiley-VCH, Weinheim, 2000. doi:10.1002/14356007.a04_405
  8. ^Eagleson, Mary (translated by) (1994). Concise Encyclopedia Chemistry (Illustrated, revised, English language ed.). Berlin [u.a.]: Walter De Gruyter. p. 996. ISBN 9783110114515. 
  9. ^"Water dispersion of cellulose II nanocrystals prepared by TEMPO-mediated oxidation of mercerized cellulose at pH 4.8". Cellulose. 17: 279–288. doi:10.1007/s10570-009-9381-2. 
  10. ^"Bromide: Potassium & Sodium". canine-epilepsy.com. Canine-Epilepsy Resources. 2011-05-31. Retrieved 2014-06-11. 

Мидж повернулась на вращающемся стуле. - Такой список выдает только принтер Фонтейна. Ты это отлично знаешь. - Но такие сведения секретны.

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