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| Names | |
|---|---|
| IUPAC name
Sodium hexahydroxostannate(IV) | |
| Other names
disodium hexahydroxyltin | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider |
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| ECHA InfoCard | 100.031.554 
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| EC Number |
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PubChem CID |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| H6Na2O6Sn | |
| Molar mass | 266.73 g/mol |
| Appearance | Colorless or white solid |
| Density | 4.68 g/cm3 |
| Boiling point | N/A |
| Hazards | |
| GHS labelling: | |
 
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| Danger | |
| H314, H315, H319, H335, H412 | |
| P260, P261, P264, P271, P273, P280, P301+P330+P331, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P310, P312, P321, P332+P313, P337+P313, P362, P363, P403+P233, P405, P501 | |
| NFPA 704 (fire diamond) | |
| Flash point | 57 °C (135 °F; 330 K) |
| N/A | |
| Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
2132 mg/kg [Mouse] |
| Safety data sheet (SDS) | [1][1] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Sodium stannate, formally sodium hexahydroxostannate(IV), is the inorganic compound with the formula Na2[Sn(OH)6]. This colourless salt forms upon dissolving metallic tinortin(IV) oxideinsodium 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]
A similar reaction occurs when tin dioxide is dissolved in base:
The anhydrous form can also be prepared from tin dioxide by roasting with sodium carbonate in a mixed carbon monoxide / carbon dioxide environment:[7]
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]
