Tin(IV) oxide
Chemical compound known as stannic oxide, cassiterite and tin ore / From Wikipedia, the free encyclopedia
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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.[9] With many other names, this oxide of tin is an important material in tin chemistry. It is a colourless, diamagnetic, amphoteric solid.
Quick Facts Names, Identifiers ...
Names | |
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IUPAC name
Tin (IV) Oxide | |
Other names
Stannic oxide, Tin(IV) oxide, Flowers of tin,[1] Cassiterite | |
Identifiers | |
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3D model (JSmol) |
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ChemSpider |
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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[2] |
Odor | Odorless |
Density | 6.95 g/cm3 (20 °C)[3] 6.85 g/cm3 (24 °C)[4] |
Melting point | 1,630 °C (2,970 °F; 1,900 K)[3][4] |
Boiling point | 1,800–1,900 °C (3,270–3,450 °F; 2,070–2,170 K) Sublimes[3] |
Insoluble[4] | |
Solubility | Soluble in hot concentrated alkalis,[4] concentrated acids Insoluble in alcohol[3] |
−4.1·10−5 cm3/mol[4] | |
Refractive index (nD) |
2.006[5] |
Structure | |
Rutile tetragonal, tP6[6] | |
P42/mnm, No. 136[6] | |
4/m 2/m 2/m[6] | |
α = 90°, β = 90°, γ = 90° | |
Octahedral (Sn4+) Trigonal planar (O2−) | |
Thermochemistry | |
Heat capacity (C) |
52.6 J/mol·K[4] |
Std molar entropy (S⦵298) |
49.04 J/mol·K[4][7] |
Std enthalpy of formation (ΔfH⦵298) |
−577.63 kJ/mol[4][7] |
Gibbs free energy (ΔfG⦵) |
−515.8 kJ/mol[4] |
Hazards | |
NFPA 704 (fire diamond) | |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
> 20 g/kg (rats, oral)[8] |
NIOSH (US health exposure limits): | |
PEL (Permissible) |
none[2] |
REL (Recommended) |
TWA 2 mg/m3[2] |
IDLH (Immediate danger) |
N.D.[2] |
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).
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