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An x-ray analysis of the crystal structure of barium hydroxide octahydrate has been carried out by two-dimensional Fourier methods. The monoclinic crystals belong to the space group  P 2 1 / n  and have four formula units in a cell of dimensions  a  = 9.35 Å,  b  = 9.28 Å,  c  = 11.87 Å with  β  = 99°. The  R  factor for 1020 visually observed reflections in eight zones is 0.124. The barium ion in this structure is found to be coordinated by eight water oxygens in the form of a slightly distorted Archimedean antiprism at distances between 2,69 Å and 2.77 Å. Based on the interatomic distances hydrogen bonds have been proposed, which link the oxygen atoms with one another utilising all the hydrogen atoms in the unit cell.

The crystal structure of barium hydroxide octahydrate Ba(OH) 2 ·8H 2 O*