Sodium zincate

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.[1]

Sodium zincate
Names
IUPAC name
sodium tetrahydroxozincate(II)
Identifiers
3D model (JSmol)
ECHA InfoCard 100.032.117
EC Number
  • 235-3 ft42-1
  • InChI=1S/2Na.4H2O.Zn/h;;4*1H2;/q2*+1;;;;;+2/p-4
  • [OH-].[OH-].[OH-].[OH-].[Na+].[Na+].[Zn+2]
Properties
Na2[Zn(OH)4]
Molar mass 179.418 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Hydroxyzincates

Solutions of sodium zincate may be prepared by dissolving zinc, zinc hydroxide, or zinc oxide in an aqueous solution of sodium hydroxide.[2] Simplified equations for these complex processes are:

ZnO + H2O + 2 NaOH → Na2Zn(OH)4
Zn + 2 H2O + 2 NaOH → Na2Zn(OH)4 + H2

From such solutions, one can crystallize salts of containing the anions Zn(OH)42−, Zn2(OH)62−, and Zn(OH)64−. Na2Zn(OH)4 consists of tetrahedral zincate ion and octahedral sodium cations.[3]
The salt Sr2Zn(OH)6 features zinc in an octahedral coordination sphere.

Oxozincates

Related oxides are also known such as Na2ZnO2,[4] Na2Zn2O3,[5] Na10Zn4O9.[6]

References
  1. Glenn O. Mallory, Juan B. Hajdu, (1990), Electroless Plating: Fundamentals and Applications, American Electroplaters and Surface Finishers Society, , William Andrew Inc., ISBN 0-936569-07-7
  2. Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
  3. Synthese und Kristallstruktur von Na2Zn(OH)4, R. Stahl , R. Niewa , H. Jacobs, Zeitschrift für anorganische und allgemeine Chemie, volume 625, pp. 48 - 50, doi:10.1002/(SICI)1521-3749(199901)625:1<48::AID-ZAAC48>3.0.CO;2-L
  4. D. Trinschek, M. Jansen (1996): "Na2ZnO2, ein neues Natriumzinkat". Zeitschrift für Naturforschung B, volume 51, issue 5, pages 711-714. doi:10.1515/znb-1996-0515
  5. Eine neue Modifikation von Na2Zn2O3, D. Trinschek, M. Jansen: , Z. Naturforschung 51b, (1996), 917-21
  6. 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
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