Silver oxide
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This article is about silver(I) oxide. For the mixed-valence oxide, see Silver(I,III) oxide.
Silver oxide is the chemical compound with the formula Ag2O. It is a fine black or dark brown powder that is used to prepare other silver compounds.
Quick Facts Names, Identifiers ...
Names | |
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IUPAC name
Silver(I) oxide | |
Other names
Silver rust, Argentous oxide, Silver monoxide | |
Identifiers | |
3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.039.946 |
EC Number |
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MeSH | silver+oxide |
PubChem CID |
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RTECS number |
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UNII | |
CompTox Dashboard (EPA) |
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Properties | |
Ag2O | |
Molar mass | 231.735 g·mol−1 |
Appearance | Black/ brown cubic crystals |
Odor | Odorless[1] |
Density | 7.14 g/cm3 |
Melting point | 300 °C (572 °F; 573 K) decomposes from ≥200 °C[2][3] |
0.013 g/L (20 °C) 0.025 g/L (25 °C)[4] 0.053 g/L (80 °C)[2] | |
Solubility product (Ksp) of AgOH |
1.52·10−8 (20 °C) |
Solubility | Soluble in acid, alkali Insoluble in ethanol[4] |
−134.0·10−6 cm3/mol | |
Structure | |
Cubic | |
Pn3m, 224 | |
Thermochemistry | |
Heat capacity (C) |
65.9 J/mol·K[4] |
Std molar entropy (S⦵298) |
122 J/mol·K[5] |
Std enthalpy of formation (ΔfH⦵298) |
−31 kJ/mol[5] |
Gibbs free energy (ΔfG⦵) |
−11.3 kJ/mol[3] |
Hazards | |
GHS labelling: | |
[6] | |
Danger | |
H272, H315, H319, H335[6] | |
P220, P261, P305+P351+P338[6] | |
NFPA 704 (fire diamond) | |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
2.82 g/kg (rats, oral)[1] |
Related compounds | |
Related compounds |
Silver(I,III) 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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