Beryllium hydroxide

Berylliumdihydroxid

Colorless gel

Fixed

1.924 g · cm -3

Sparingly soluble in water

Beryllium compounds

Risk

Beryllium compounds

-902.5 KJ / mol

Template: Infobox chemical / molecular formula search available

Beryllium is a chemical compound selected from the group of the hydroxides.

Production and representation

Beryllium hydroxide can be recovered by precipitation from a Berylliumsalzlösung by adding ammonia solution or a solution of a metal hydroxide.

Better, however, the representation of crystalline beryllium hydroxide is achieved by saturation of a hot solution of Natriumtetrahydroxoberyllat and slow cooling of the solution.

Properties

Beryllium hydroxide is a colorless gel that is practically insoluble in water. When heated above 400 ° C it decomposes to beryllium:

Beryllium hydroxide is amphoteric, ie dissolves in both acids to form [Be (H2O ) 4] 2 , as well as in alkaline solutions to form [ Be (OH ) 4] 2 -.

In the crystal structure of each beryllium beryllium ion is coordinated by four hydroxide ions which form an only slightly distorted tetrahedron. Since each hydroxide is bound to two Be2 ions, results in a three-dimensional network of corner-sharing tetrahedra. There are numerous hydrogen bonds between the hydroxide ions.