Silver sulfate

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Silver sulfate
Skeletal formula of silver sulfate
Sample of silver sulfate
Identifiers
CAS number 10294-26-5 YesY
PubChem 159865 YesY
ChemSpider 140554 YesY
UNII 8QG6HV4ZPO YesY
EC-number 233-653-7
UN number 3077
Jmol-3D images Image 1
Properties
Molecular formula Ag2O4S
Molar mass 311.80 g mol−1
Appearance Colorless crystals
Odor Odorless
Density 5.45 g/cm3 (25 °C)
4.84 g/cm3 (660 °C)[1]
Melting point 652.2–660 °C (1,206.0–1,220.0 °F; 925.4–933.1 K)[1][5]
Boiling point 1,085 °C (1,985 °F; 1,358 K)[3][5]
Solubility in water 0.57 g/100 mL (0 °C)
0.69 g/100 mL (10 °C)
0.83 g/100 mL (25 °C)
0.96 g/100 mL (40 °C)
1.33 g/100 mL (100 °C)[2]
Solubility product, Ksp 1.2·10−5[1]
Solubility Dissolves in aq. acids, alcohols, acetone, ether, acetates, amides[2]
Insoluble in ethanol[3]
Solubility in sulfuric acid 8.4498 g/L (0.1 molH2SO4/LH2O)[2]
25.44 g/100 g (13 °C)
31.56 g/100 g (24.5 °C)
127.01 g/100 g (96 °C)[3]
Solubility in ethanol 7.109 g/L (0.5 nEtOH/H2O)[2]
Solubility in acetic acid 7.857 g/L (0.5 nAcOH/H2O)[2]
Magnetic susceptibility −9.29·10−5 cm3/mol[1]
Refractive index (nD) nα = 1.756
nβ = 1.775
nγ = 1.782[4]
Structure
Crystal structure Orthorhombic, oF56[4]
Space group Fddd, No. 70[4]
Point group 2/m 2/m 2/m[4]
Lattice constant a = 10.2699(5) Å, b = 12.7069(7) Å, c = 5.8181(3) Å[4]
Lattice constant α = 90°, β = 90°, γ = 90°
Thermochemistry
Specific
heat capacity
C
131.4 J/mol·K[1]
Std molar
entropy
So298
200.4 kJ/mol[1]
Std enthalpy of
formation
ΔfHo298
−715.9 kJ/mol[1]
Gibbs free energy ΔG −618.4 J/mol·K[1]
Hazards
GHS pictograms The corrosion pictogram in the Globally Harmonized System of Classification and Labelling of Chemicals (GHS)The environment pictogram in the Globally Harmonized System of Classification and Labelling of Chemicals (GHS)[6]
GHS signal word Danger
GHS hazard statements H318, H410[6]
GHS precautionary statements P273, P280, P305+351+338, P501[6]
EU classification Irritant Xi Dangerous for the Environment (Nature) N
R-phrases R41, R50/53
S-phrases S26, S39, S60, S61
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g., chloroform Reactivity code 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g., calcium Special hazards (white): no codeNFPA 704 four-colored diamond
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 YesY (verify) (what is: YesY/N?)
Infobox references

Silver sulfate (Ag2SO4) is an ionic compound of silver used in silver plating and as a non-staining substitute to silver nitrate. This sulfate is stable under ordinary conditions of use and storage, though it darkens upon exposure to air or light. It is minimally soluble in water.

Preparation[edit]

Silver sulfate is prepared by adding sulfuric acid to a solution of silver nitrate:

2 Ag+(aq) + SO42−(aq) → Ag2SO4(s)

The precipitate is then washed with hot water and preparation is under ruby red illumination.

Silver(II) sulfate[edit]

The synthesis of silver(II) sulfate (AgSO4) with a divalent silver ion instead of a monovalent silver ion was first reported in 2010[7] by adding sulfuric acid to silver(II) fluoride (HF escapes). It is a black solid that decomposes exothermally at 120°C with evolution of oxygen and the formation of the pyrosulfate.

References[edit]

  1. ^ a b c d e f g h Lide, David R., ed. (2009). CRC Handbook of Chemistry and Physics (90th ed.). Boca Raton, Florida: CRC Press. ISBN 978-1-4200-9084-0. 
  2. ^ a b c d e Seidell, Atherton; Linke, William F. (1919). Solubilities of Inorganic and Organic Compounds (2nd ed.). New York: D. Van Nostrand Company. p. 622–623. 
  3. ^ a b c Anatolievich, Kiper Ruslan. "silver sulfate". http://chemister.ru. Retrieved 2014-07-19. 
  4. ^ a b c d e Morris, Marlene C.; McMurdie, Howard F.; Evans, Eloise H.; Paretzkin, Boris; Groot, Johan H. de; Hubbard, Camden R.; Carmel, Simon J. (1976-06). "13". Standard X-ray Diffraction Powder Patterns 25. Washington: Institute for Materials Research National Bureau of Standards.  Check date values in: |date= (help)
  5. ^ a b c "MSDS of Silver sulfate". https://www.fishersci.ca. Fisher Scientific, Inc. Retrieved 2014-07-19. 
  6. ^ a b c Sigma-Aldrich Co., Silver sulfate. Retrieved on 2014-07-19.
  7. ^ Malinowski, P.; Derzsi, M.; Mazej, Z.; Jagličić, Z.; Gaweł, B.; Lasocha, W.; Grochala, W. (2010). "Ag(II)SO(4): A Genuine Sulfate of Divalent Silver with Anomalously Strong One-Dimensional Antiferromagnetic Interactions.". Angewandte Chemie (International ed. in English) 49 (9): 1683–1686. doi:10.1002/anie.200906863. PMID 20084660.  edit