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Silver sulfate

Silver sulfate
Skeletal formula of silver sulfate
Sample of silver sulfate
Names
IUPAC name
Silver sulfate
Other names
disilver(1+) salt
Identifiers
3D model (Jmol)
ChemSpider
ECHA InfoCard 100.030.581
EC Number 233-653-7
PubChem CID
UNII
UN number 3077
Properties
Ag2SO4
Appearance Colorless crystals
Odor Odorless
Density 5.45 g/cm3 (25 °C)
4.84 g/cm3 (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)
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)
1.2·10−5
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)
−9.29·10−5 cm3/mol
nα = 1.756
nβ = 1.775
nγ = 1.782
Structure
Orthorhombic, oF56
Fddd, No. 70
2/m 2/m 2/m
a = 10.2699(5) Å, b = 12.7069(7) Å, c = 5.8181(3) Å
α = 90°, β = 90°, γ = 90°
Thermochemistry
131.4 J/mol·K
200.4 kJ/mol
−715.9 kJ/mol
−618.4 J/mol·K
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)
GHS signal word Danger
H318, H410
P273, P280, P305+351+338, P501
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 otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
YesY  (what is YesYN ?)
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.

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

AgNO3(aq) + H2SO4(aq) = AgHSO4(aq) + HNO3(aq)

2 AgHSO4(aq) <=> Ag2SO4(s) + H2SO4(aq) reversible reaction

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

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 exothermally at 120 °C with evolution of oxygen and the formation of the pyrosulfate.



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