Tin(IV) oxide
Tin(IV) oxide, also known as stannic oxide, is the inorganic compound with the formula SnO2. The mineral form of SnO2 is called cassiterite, and this is the main ore of tin. With many other names, this oxide of tin is an important material in tin chemistry. It is a colourless, diamagnetic, amphoteric solid.
| Names | |
|---|---|
| IUPAC name
Tin (IV) Oxide | |
| Other names
Stannic oxide, Tin(IV) oxide, Flowers of tin, Cassiterite | |
| Identifiers | |
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3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.038.311 |
| EC Number |
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PubChem CID |
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| RTECS number |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| O2Sn | |
| Molar mass | 150.708 g·mol−1 |
| Appearance | Yellowish or light grey powder |
| Odor | Odorless |
| Density | 6.95 g/cm3 (20 °C) 6.85 g/cm3 (24 °C) |
| Melting point | 1,630 °C (2,970 °F; 1,900 K) |
| Boiling point | 1,800–1,900 °C (3,270–3,450 °F; 2,070–2,170 K) Sublimes |
| Insoluble | |
| Solubility | Soluble in hot concentrated alkalis, concentrated acids Insoluble in alcohol |
| −4.1·10−5 cm3/mol | |
Refractive index (nD) |
2.006 |
| Structure | |
| Rutile tetragonal, tP6 | |
| P42/mnm, No. 136 | |
| 4/m 2/m 2/m | |
a = 4.737 Å, c = 3.185 Å α = 90°, β = 90°, γ = 90° | |
| Octahedral (Sn4+) Trigonal planar (O2−) | |
| Thermochemistry | |
Heat capacity (C) |
52.6 J/mol·K |
Std molar entropy (S⦵298) |
49.04 J/mol·K |
Std enthalpy of formation (ΔfH⦵298) |
−577.63 kJ/mol |
Gibbs free energy (ΔfG⦵) |
−515.8 kJ/mol |
| Hazards | |
| NFPA 704 (fire diamond) | |
| Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
> 20 g/kg (rats, oral) |
| NIOSH (US health exposure limits): | |
PEL (Permissible) |
none |
REL (Recommended) |
TWA 2 mg/m3 |
IDLH (Immediate danger) |
N.D. |
| Safety data sheet (SDS) | ICSC 0954 |
| Related compounds | |
| Tin(II) oxide | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
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