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Silver sulfate

Names
IUPAC name Silver(I) sulfate
Other names Disilver sulfate Argentous sulfate
Identifiers
CAS Number	10294-26-5
3D model (JSmol)	Interactive image
ChemSpider	140554
ECHA InfoCard	100.030.581
EC Number	233-653-7
PubChem CID	159865
UNII	8QG6HV4ZPO
UN number	3077
CompTox Dashboard (EPA)	DTXSID70172884
InChI InChI=1S/2Ag.H2O4S/c;;1-5(2,3)4/h;;(H2,1,2,3,4)/q2*+1;/p-2Key: YPNVIBVEFVRZPJ-UHFFFAOYSA-L InChI=1/2Ag.H2O4S/c;;1-5(2,3)4/h;;(H2,1,2,3,4)/q2*+1;/p-2Key: YPNVIBVEFVRZPJ-NUQVWONBAA
SMILES ..S()(=O)=O
Properties
Chemical formula	Ag2SO4
Molar mass	311.79 g·mol
Appearance	Colorless solid
Odor	Odorless
Density	5.45 g/cm (25 °C) 4.84 g/cm (660 °C)
Melting point	652.2–660 °C (1,206.0–1,220.0 °F; 925.4–933.1 K)
Boiling point	1,085 °C (1,985 °F; 1,358 K) decomposition
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)
Solubility product (Ksp)	1.2·10
Solubility	Dissolves in aq. acids, alcohols, acetone, ether, acetates, amides Insoluble in ethanol
Solubility in sulfuric acid	8.4498 g/L (0.1 molH2SO4/LH2O) 25.44 g/100 g (13 °C) 31.56 g/100 g (24.5 °C) 127.01 g/100 g (96 °C)
Solubility in ethanol	7.109 g/L (0.5 nEtOH/H2O)
Solubility in acetic acid	7.857 g/L (0.5 nAcOH/H2O)
Magnetic susceptibility (χ)	−9.29·10 cm/mol
Refractive index (nD)	nα = 1.756 nβ = 1.775 nγ = 1.782
Structure
Crystal structure	Orthorhombic, oF56
Space group	Fddd, No. 70
Point group	2/m 2/m 2/m
Lattice constant	a = 10.2699(5) Å, b = 12.7069(7) Å, c = 5.8181(3) Åα = 90°, β = 90°, γ = 90°
Thermochemistry
Heat capacity (C)	131.4 J/mol·K
Std molar entropy (S298)	200.4 J/mol·K
Std enthalpy of formation (ΔfH298)	−715.9 kJ/mol
Gibbs free energy (ΔfG)	−618.4 kJ/mol
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H318, H410
Precautionary statements	P273, P280, P305+P351+P338, P501
NFPA 704 (fire diamond)	2 0 1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Y verify (what is  ?) Infobox references

Silver sulfate is the inorganic compound with the formula Ag₂SO₄. It is a white solid with low solubility in water.

Preparation and structure

Silver sulfate precipitates as a solid when an aqueous solution of silver nitrate is treated with sulfuric acid:

2 AgNO₃ + H₂SO₄ → Ag₂SO₄ + 2 HNO₃

It is purified by recrystallization from concentrated sulfuric acid, a step that expels traces of nitrate. Silver sulfate and anhydrous sodium sulfate adopt the same structure.

Silver(II) sulfate

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

AgF₂ + H₂SO₄ → AgSO₄ + 2 HF

4 AgSO₄ → 2 Ag₂S₂O₇ + O₂

References

1. ^ 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. ^ Seidell, Atherton; Linke, William F. (1919). Solubilities of Inorganic and Organic Compounds (2nd ed.). New York: D. Van Nostrand Company. pp. 622–623.
3. ^ Anatolievich, Kiper Ruslan. "silver sulfate". Retrieved 2014-07-19.
4. ^ Morris, Marlene C.; McMurdie, Howard F.; Evans, Eloise H.; Paretzkin, Boris; Groot, Johan H. de; Hubbard, Camden R.; Carmel, Simon J. (June 1976). "13". Standard X-ray Diffraction Powder Patterns. Vol. 25. Washington: Institute for Materials Research National Bureau of Standards.
5. ^ "MSDS of Silver sulfate". Fisher Scientific, Inc. Retrieved 2014-07-19.
6. ^ Sigma-Aldrich Co., Silver sulfate. Retrieved on 2014-07-19.
7. O. Glemser; R. Sauer (1963). "Silver Sulfate". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. Vol. 2pages=1042. NY, NY: Academic Press.
8. Zachariasen, W. H. (1932). "Note on the Crystal Structure of Silver Sulphate, Ag₂SO₄". Zeitschrift für Kristallographie - Crystalline Materials. 82 (1–6): 161–162. doi:10.1524/zkri.1932.82.1.161. S2CID 101362527.
9. 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 Edition in English. 49 (9): 1683–1686. doi:10.1002/anie.200906863. PMID 20084660.

• Silver compounds
• Sulfates