Strontium bromide

Colorless solid

• 247.44 g · mol -1 ( pure substance)
• 355.53 g · mol -1 ( hexahydrate)

Fixed

• 4.216 g · cm -3 ( pure substance)
• 2.386 g · cm -3 ( hexahydrate)

643 ° C

2146 ° C

• Readily soluble in water: 1070 g · l-1 (25 ° C)
• Soluble in alcohol, insoluble in ether

Attention

1 g · kg -1 ( LD50, rat, i.v.)

10.12 kJ · mol -1

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Strontium is strontium salt of hydrobromic acid.

Production

Strontium bromide can be prepared by salt-forming reaction of strontium hydroxide and hydrogen bromide.

Also from strontium carbonate and Strontiumcarbid is the synthesis possible.

Properties

Strontium bromide is readily soluble in water, with increasing temperature also increases the solubility: at 0 ° C to dissolve 852 g, at 25 ° C and 1,070 g at 100 ° C. 2225 g of strontium bromide in 1 liter of water. It occurs as hexahydrate on SrBr2 · 6 H2O, which converts at 89 ° C with crystalline water in the dihydrate SrBr2 · 2 H2O and finally at 180 ° C in the anhydrate. Strontium bromide is soluble in ethanol, from these solutions crystals separate the formula 2 SrBr2 · 5 C2H5OH from.

Anhydrous strontium bromide crystallizes in the orthorhombic crystal system, space group Pnma with the lattice parameters a = 920 pm, b = 1142 pm and c = 430 pm, and four formula units per unit cell.

The hexahydrate crystallizes in the trigonal space group P321 or P312 with lattice parameters a = 823 pm and c = 416 pm. In the unit cell contains a formula unit.

Use

Strontium acts as well as other salts of hydrobromic acid ( lithium bromide, potassium bromide ) central absorption. The use as a sedative is obsolete today.