NICKEL(II) BROMIDE TRIHYDRATE Chemical Properties

Melting point:

963 °C(lit.)

Density 

5.098 g/mL at 25 °C(lit.)

form 

powder

Water Solubility 

Soluble in water, alcohol

Sensitive 

Hygroscopic

Merck 

14,6502

Exposure limits

ACGIH: TWA 0.1 mg/m3
NIOSH: IDLH 10 mg/m3; TWA 0.015 mg/m3

CAS DataBase Reference

7789-49-3(CAS DataBase Reference)

Safety Information

Hazard Codes 

T,N

Risk Statements 

45-22-43-50/53

Safety Statements 

53-36/37-45-60-61

RIDADR 

UN 3077 9/PG 3

WGK Germany 

3

TSCA 

Yes

HazardClass 

6.1

PackingGroup 

III

MSDS

• Language:English Provider:ACROS
• Language:English Provider:SigmaAldrich
• Language:English Provider:ALFA

NICKEL(II) BROMIDE TRIHYDRATE Usage And Synthesis

Chemical Properties

(1) Brownish-yellow solid or yellow, lustrous scales.(2) Deliquescent, greenish scales; loses 3H2O at 300C. Soluble in water, alcohol, ether, and ammonium hydroxide.

Chemical Properties

The green hexahydrate NiBr2-6H2O readily evolves water; crystallization from aqueous solutions above 29° yields the trihydrate NiBr2-3H2O. The hexahydrate can be dehydrated to a dihydrate over concentrated sulphuric acid at 5°. The environment of the nickel atoms in NiBr2-6H20 is 2Br and 4H20 and in NiBr2-2H20 4Br and 2H20 ; in both cases the Ni-Br distance is 2.6 and the Ni-O distance 2.0 ?.

Uses

It is used in Soporific and sedatives pharmaceutical Industry, Photosensitive industry, Analytical Chemistry, and also electrolyte in high energy battery.

Preparation

Anhydrous NiBr2 is most conveniently prepared by the action of bromine on nickel, either at red heat or in ethereal solution at room temperature74 or by dehydration of the hexahydrate at about 140°. It crystallizes with the CdCl2 type structure, the nickel atoms being surrounded octahedrally by bromine atoms at 2.57 ?.

Hazard

See nickel.

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