Key points are not available for this paper at this time.
There have been two previous structure determinations of the title compound, Na2WO4·2H2O: in 1969 Mitra & Verma (1969). Indian J. Chem. 7, 598–602 and in 1974 Okada et al. (1974a). Bull. Tokyo Inst. Technol. 120, 7–11. However, both structures are incorrect according to their entries in the Inorganic Crystal Structure Database (2007), URL: http://www.fiz-karlsruhe.de/ecid/Internet/en/DB/icsd/index.html. Despite the high absorption coefficient, the H-atom positions could be observed and refined in the present study. Owing to the accurate analytical absorption correction, all non-H atoms could be refined satisfactorily with anisotropic displacement parameters. There are hydrogen-bonding interactions between all H atoms and the O atoms of the tungstate dianion.
Louis J. Farrugia (2007) studied this question.