Sodium zincate refers to anionic zinc oxides or hydroxides, depending on conditions. In the applications of these materials, the exact formula is not necessarily important and it is likely that aqueous zincate solutions consist of mixtures.
Hydroxyzincates
Solutions of sodium
zincate
In chemistry the term zincate may refer to several substances containing the element zinc:
* usually the anion ZnO22−, more properly called tetrahydroxozincate or salts thereof, such as sodium zincate .
* the polymeric anion n(OH)3−and its ...
may be prepared by dissolving
zinc
Zinc is a chemical element with the symbol Zn and atomic number 30. Zinc is a slightly brittle metal at room temperature and has a shiny-greyish appearance when oxidation is removed. It is the first element in group 12 (IIB) of the periodi ...
,
zinc hydroxide, or
zinc oxide
Zinc oxide is an inorganic compound with the formula . It is a white powder that is insoluble in water. ZnO is used as an additive in numerous materials and products including cosmetics, food supplements, rubbers, plastics, ceramics, glass, cement ...
in an aqueous solution of
sodium hydroxide.
Simplified equations for these complex processes are:
:ZnO + H
2O + 2 NaOH → Na
2Zn(OH)
4
:Zn + 2 H
2O + 2 NaOH → Na
2Zn(OH)
4 + H
2
From such solutions, one can crystallize salts of containing the anions Zn(OH)
42−, Zn
2(OH)
62−, and Zn(OH)
64−. Na
2Zn(OH)
4 consists of tetrahedral zincate ion and octahedral sodium cations.
The salt Sr
2Zn(OH)
6 features zinc in an octahedral coordination sphere.
Oxozincates
Related oxides are also known such as Na
2ZnO
2,
[D. Trinschek, M. Jansen (1996): "Na2ZnO2, ein neues Natriumzinkat". ''Zeitschrift für Naturforschung B'', volume 51, issue 5, pages 711-714. ] Na
2Zn
2O
3, Na
10Zn
4O
9.
[Ein neues Oxozinkat mit trigonal-planar koordiniertem Zink, D. Trinschek, M. Jansen: Na10Zn4O9, Zeitschrift für anorganische und allgemeine Chemie volume 622 (1996), pp. 245-50]
References
Sodium compounds
Zinc compounds
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