Sodium tetrahydroxozincate

Structural formula
No drawing available
General
Surname	Sodium tetrahydroxozincate
other names	Sodium zincate
Molecular formula	Na 2 [Zn (OH) 4 ]
Brief description	colorless, fine crystalline thin platelets
External identifiers / databases
CAS number 12179-14-5 EC number 235-342-1 ECHA InfoCard 100.032.117 PubChem 166652 Wikidata Q2044346
properties
Molar mass	179.40 g mol −1
Physical state	firmly
safety instructions
GHS hazard labeling no classification available
MAK	0.1 mg m −3
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Sodium tetrahydroxozincate is an inorganic chemical compound belonging to the group of hydroxo complexes .

Extraction and presentation

Sodium tetrahydroxozincate can be obtained by reacting water with sodium hydroxide and zinc or zinc oxide or zinc cyanide .

${\displaystyle \mathrm {Zn+2\ NaOH+2\ H_{2}O\longrightarrow Na_{2}[Zn(OH)_{4}]+H_{2}} }$

${\displaystyle \mathrm {ZnO+2\ NaOH+H_{2}O\longrightarrow Na_{2}[Zn(OH)_{4}]} }$

properties

Sodium tetrahydroxozincate is obtained in the form of colorless, thin, finely crystalline platelets. Hydrolysis occurs in water . The salt is also rapidly decomposed in moist air containing CO ₂ . In addition to Na ₂ [Zn (OH) ₄ ], Na ₂ ZnO _{2 is} another metastable sodium zincate known which has a crystal structure with the space group P 2 ₁ / c (space group no. 14) . The sodium trihydroxyzincate Na [Zn (OH) ₃ ], the sodium trihydroxyzincate trihydrate Na [Zn (OH) ₃ ] · 3H ₂ O and the sodium tetrahydroxozincate dihydrate Na ₂ [Zn (OH) ₄ ] · 2H are also known ₂ O.

use

Sodium tetrahydroxozincate can be used for electroplating with zinc.

Individual evidence

1. ↑ ^{a b c} Georg Brauer: Handbook of Preparative Inorganic Chemistry , Volume III, Ferdinand Enke Verlag, Stuttgart 1981, ISBN 3-432-87823-0 , page 1765
2. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
3. ^ Entry on sodium tetrahydroxozincate in the GESTIS substance database of the IFA , accessed on February 28, 2017(JavaScript required) .
4. ↑ F. Goudriaan: The zincates of sodium. Equilibriums in the system Na2O-ZnO-H2O , in: KNAW, Proceedings, 22 I, 1919-1920, Amsterdam, 1919, pp. 179-189
5. ^ Gerhard Ertl , Helmut Knözinger , Jens Weitkamp : Preparation of Solid Catalysts . John Wiley & Sons, 2008, ISBN 3-527-62068-0 , pp. 40 ( limited preview in Google Book search).
6. ^ Mordechay Schlesinger, Milan Paunovic: Modern Electroplating . John Wiley & Sons, 2011, ISBN 1-118-06314-7 , pp. 287 ( limited preview in Google Book search).
7. ↑ D. Trinschek, M. Jansen: Na2ZnO2, a new sodium zincate / Na2ZnO2, a New Sodium Zincate. In: Zeitschrift für Naturforschung B. 51, 1996, doi : 10.1515 / znb-1996-0515 .
8. ↑ V. Jiricny, A. Roy, JW Evans: Electrodeposition of zinc from sodium zincate / hydroxide electrolytes in a spouted bed electrode. In: Metallurgical and Materials Transactions B. 31, 2000, p. 755, doi : 10.1007 / s11663-000-0113-0 .