Sodium stannate

Names
IUPAC name

Sodium hexahydroxostannate(IV)

Other names

disodium hexahydroxyltin
Sodium stannate(IV)
sodium stannate-3-water
sodium tin(IV) oxide hydrate

Identifiers

CAS Number

* 12027-70-2

3D model (JSmol)

* Interactive image

ChemSpider |

* 145444 Y

EC Number |

* 234-724-5

PubChem CID

* 131868867

UNII |

* NJ7C1V83KG

InChI

* InChI=1S/2Na.6H2O.Sn/h;;6*1H2;/q2*+1;;;;;;;+4/p-6

Key: PMPBLIIMRRPPEO-UHFFFAOYSA-H

SMILES

* [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Na+].[Na+].[Sn+4]

Properties

Chemical formula

| H6Na2O6Sn
Molar mass | 266.73 g/mol
Appearance  | Colorless or white solid
Density | 4.68 g/cm3
Boiling point | N/A
Hazards
Safety data sheet | [1][1]
GHS pictograms |
GHS Signal word | Danger

GHS hazard statements

| H314, H315, H319, H335, H412

GHS precautionary statements

| P260, P261, P264, P271, P273, P280, P301+330+331, P302+352, P303+361+353, P304+340, P305+351+338, P310, P312, P321, P332+313, P337+313, P362, P363, P403+233, P405, P501
NFPA 704 (fire diamond)  |

Flash point |  57 °C (135 °F; 330 K)

Autoignition
temperature

| N/A
Lethal dose or concentration (LD, LC):

LD50 (median dose)

| 2132 mg/kg [Mouse]

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Infobox references

Sodium stannate, formally sodium hexahydroxostannate(IV), is the inorganic compound with the formula Na2[Sn(OH)6]. This colourless salt forms upon dissolving metallic tin or tin(IV) oxide in sodium hydroxide, and is used as a stabiliser for hydrogen peroxide.[2] In older literature, stannates are sometimes represented as having the simple oxyanion SnO32−,[3] in which case this compound is sometimes named as sodium stannate-3-water and represented as Na2SnO3·3H2O, a hydrate with three waters of crystallisation.[1] The anhydrous form of sodium stannate, Na2SnO3, is recognised as a distinct compound with its own CAS Registry Number,[4] 12058-66-1 , and a distinct material safety data sheet.[5]

Alkali metal stannate compounds are prepared by dissolving elemental tin in a suitable metal hydroxide, in the case of sodium stannate by the reaction:[6]

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 anhydrous form can also be prepared from tin dioxide by roasting with sodium carbonate in a mixed carbon monoxide / carbon dioxide environment:[7]

SnO2 \+  Na2CO3 →  Na2SnO3 \+  CO2

The anion is a coordination complex that is octahedral in shape, similar to most stannates, such as the hexachlorostannate anion [SnCl6]2−. The Sn--O bond distances average 2.071 Å.[8]

## See also

* Sodium carbonate
* Sodium silicate
* Sodium germanate

## References

1. ↑ 1.0 1.1 "Material Safety Data Sheet - sodium stannate trihydrate MSDS". Science Lab. 21 May 2013. http://www.sciencelab.com/msds.php?msdsId=9925038.
2. ↑ Clark, John D. (1972). Ignition! An Informal History of Liquid Rocket Propellants. Rutgers University Press. ISBN 0813507251.
3. ↑ Similarly, stannites are sometimes represented with the anion SnO22−
4. ↑ National Center for Biotechnology Information (2017). "Sodium Stannate". PubChem. https://pubchem.ncbi.nlm.nih.gov/compound/Sodium_stannate#section=Molecular-Formula.
5. ↑ "Sodium Stannate MSDS". Santa Cruz Biotechnology. 14 June 2011. http://datasheets.scbt.com/sc-229318.pdf.
6. ↑ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0750633654.
7. ↑ Zhang, Yuanbo; Su, Zijian; Liu, Bingbing; You, Zhixiong; Yang, Guang; Li, Guanghui; Jiang, Tao (2014). "Sodium stannate preparation from stannic oxide by a novel soda roasting–leaching process". Hydrometallurgy 146: 82–88. doi:10.1016/j.hydromet.2014.03.008. Bibcode: 2014HydMe.146...82Z.
8. ↑ Jacobs, Herbert; Stahl, Rainer (2000). "Neubestimmung der Kristallstrukturen der Hexahydroxometallate Na2Sn(OH)6, K2Sn(OH)6 und K2Pb(OH)6" (in German). Z. Anorg. Allg. Chem. 626 (9): 1863–1866. doi:10.1002/1521-3749(200009)626:9<1863::AID-ZAAC1863>3.0.CO;2-M.K2Pb(OH)6&rft.jtitle=Z.+Anorg.+Allg.+Chem.&rft.aulast=Jacobs&rft.aufirst=Herbert&rft.au=Jacobs, Herbert&rft.au=Stahl, Rainer&rft.date=2000&rft.volume=626&rft.issue=9&rft.pages=1863–1866&rft_id=info:doi/10.1002/1521-3749(200009)626:9<1863::AID-ZAAC1863>3.0.CO;2-M&rfr_id=info:sid/en.wikibooks.org:Chemistry:Sodium_stannate">

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*[CID]: Compound ID
*[H314]: Causes severe skin burns and eye damage
*[H315]: Causes skin irritation
*[H319]: Causes serious eye irritation
*[H335]: May cause respiratory irritation
*[H412]: Harmful to aquatic life with long lasting effects
*[P260]: Do not breathe dust/fume/gas/mist/vapours/spray
*[P261]: Avoid breathing dust/fume/gas/mist/vapours/spray
*[P264]: Wash … thoroughly after handling
*[P271]: Use only outdoors or in a well-ventilated area
*[P273]: Avoid release to the environment
*[P280]: Wear protective gloves/protective clothing/eye protection/face protection
*[P301+330+331]: IF SWALLOWED: Rinse mouth. Do NOT induce vomiting
*[P302+352]: IF ON SKIN: Wash with soap and water
*[P303+361+353]: IF ON SKIN (or hair): Remove/Take off immediately all contaminated clothing. Rinse skin with water/shower
*[P304+340]: IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing
*[P305+351+338]: IF IN EYES: Rinse continuously with water for several minutes. Remove contact lenses if present and easy to do – continue rinsing
*[P310]: Immediately call a POISON CENTER or doctor/physician
*[P312]: Call a POISON CENTER or doctor/physician if you feel unwell
*[P321]: Specific treatment (see … on this label)
*[P332+313]: If skin irritation occurs: Get medical advice/attention
*[P337+313]: Get medical advice/attention
*[P362]: Take off contaminated clothing and wash before reuse
*[P363]: Wash contaminated clothing before reuse
*[P403+233]: Store in a well ventilated place. Keep container tightly closed
*[P405]: Store locked up
*[P501]: Dispose of contents/container to …