Silver sulfate

Silver sulfate
IUPAC name Silver sulfate
Other names Sulfuric acid, disilver(1+) salt
Identifiers
CAS number	10294-26-5 Y
PubChem	159865
ChemSpider	140554 Y
UNII	8QG6HV4ZPO Y
Jmol-3D images	Image 1
SMILES [Ag+].[Ag+].[O-]S([O-])(=O)=O
InChI InChI=1S/2Ag.H2O4S/c;;1-5(2,3)4/h;;(H2,1,2,3,4)/q2*+1;/p-2 Y Key: YPNVIBVEFVRZPJ-UHFFFAOYSA-L Y InChI=1/2Ag.H2O4S/c;;1-5(2,3)4/h;;(H2,1,2,3,4)/q2*+1;/p-2 Key: YPNVIBVEFVRZPJ-NUQVWONBAA
Properties
Molecular formula	Ag2SO4
Molar mass	311.799 g/mol
Appearance	colourless crystals
Density	5.45 g/cm3
Melting point	652 °C, 925 K, 1206 °F
Boiling point	1085 °C, 1358 K, 1985 °F
Solubility in water	0.31 g/100 mL
Solubility	dissolves in nitric acid
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
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

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

2 Ag⁺(aq) + SO₄^2-(aq) → Ag₂SO₄ (s)

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

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

External links

• MSDS for Silver Sulfate