Sodium stannate

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Sodium stannate
White powder of sodium stannate
Identifiers
CAS number 12027-70-2
Properties
Molecular formula H6Na2O6Sn
Molar mass 266.73 g/mol
Appearance Colorless or white solid
Density 4.68 g/cm3
Boiling point N/A
Hazards
MSDS [1][1]
EU classification T+,
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g., chloroform Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Flash point 57°C
Autoignition temperature N/A
LD50 2132 mg/kg [Mouse]
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Sodium stannate is the inorganic compound with the formula Na2Sn(OH)6. This colourless salt forms upon dissolving tin or tin dioxide in sodium hydroxide. Sodium stannate is used as a stabiliser for hydrogen peroxide.[2]

Alkali metal stannate compounds are prepared by dissolving tin in sodium hydroxide:[3]

Sn + 2 NaOH + 4 H2O → Na2[Sn(OH)6] + 2 H2

A similar reaction occurs when tin dioxide is dissolved in base:

SnO2 + 2 NaOH + 2 H2O → Na2[Sn(OH)6]

The anion is octahedral as are most stannates, e.g., the hexachlorostannate anion [SnCl6]2-. The Sn-O distances average 2.071 Å.[4] In some old literature, stannates are sometimes represented as the simple oxyanion SnO32-.

References[edit]

  1. ^ "Sodium stannate trihydrate MSDS". Science Lab. Retrieved 13 November 2012. 
  2. ^ Clark, John D. (1972). Ignition! An Informal History of Liquid Rocket Propellants. New Brunswick, New Jersey: Rutgers University Press. ISBN 0-8135-0725-1.
  3. ^ Greenwood, N. N.; & Earnshaw, A. (1997). Chemistry of the Elements (2nd Edn.), Oxford:Butterworth-Heinemann. ISBN 0-7506-3365-4.
  4. ^ Herbert Jacobs Rainer Stahl "Neubestimmung der Kristallstrukturen der Hexahydroxometallate Na2Sn(OH)6, K2Sn(OH)6 und K2Pb(OH)6" Zeitschrift für anorganische und allgemeine Chemie 2000, Volume 626, pages 1863–1866. doi:10.1002/1521-3749(200009)626:9<1863::AID-ZAAC1863>3.0.CO;2-M