Na2MoO4-K2MoO4-H2O system at 25°C

Crystal structures of deuterated sodium molybdate dihydrate and sodium tungstate dihydrate from time-of-flight neutron powder diffraction

“…Na 2 MoO 4 and Na 2 WO 4 are unusual amongst the alkali metal mono-molybdates and mono-tungstates in being highly soluble in water and forming polyhydrated crystals. Additionally, sodium apparently plays a significant role in the solvation of other alkali metal ions to form a range of double molybdate and tungstate hydrates (Klevtsova et al, 1990;Klevtsov et al, 1997;Mirzoev et al, 2010), for example, Na 3 K(MoO 4 ) 2 Á9H 2 O. Both dihydrate and decahydrate varieties of the two title compounds are known, their solubilities as a function of temperature being well characterised (Funk, 1900;Zhilova et al, 2008).…”