Silver sulfite

Silver sulfite is the chemical compound with the formula Ag₂SO₃. This unstable silver compound when heated and/or in light it decomposes to silver dithionate and silver sulfate.^[4]

Silver sulfite

Skeletal formula of silver sulfite
Crystal structure of silver sulfite
Names
IUPAC name Silver(I) sulfite, Silver sulfite
Identifiers
CAS Number	13465-98-0 Y
3D model (JSmol)	Interactive image
ChemSpider	2341258 Y
ECHA InfoCard	100.033.362
EC Number	236-714-6
PubChem CID	3084149
CompTox Dashboard (EPA)	DTXSID90889609
InChI InChI=1S/2Ag.H2O3S/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;/p-2 Y Key: WYCFMBAHFPUBDS-UHFFFAOYSA-L Y
SMILES [O-]S(=O)[O-].[Ag+].[Ag+]
Properties
Chemical formula	Ag2O3S
Molar mass	295.79 g·mol−1
Appearance	White crystals
Odor	Odorless
Melting point	100 °C (212 °F; 373 K) decomposes[1][2]
Solubility in water	4.6 mg/L (20 °C)[1]
Solubility product (Ksp)	1.5·10−14[1]
Solubility	Soluble in aq. NH4OH, alkali sulfites, AcOH Decomposes in strong acids[3] Insoluble in liquid SO2[4]
Structure
Crystal structure	Monoclinic, mP24[5]
Space group	P21/c, No. 14[5]
Point group	2/m[5]
Lattice constant	a = 4.6507 Å, b = 7.891 Å, c = 11.173 Å[5] α = 90°, β = 120.7°, γ = 90°
Hazards
GHS labelling:
Pictograms	[2]
Signal word	Warning
Hazard statements	H315, H319, H335[2]
Precautionary statements	P261, P305+P351+P338[2]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

Preparation

Silver sulfite can be prepared by dissolving silver nitrate with the stoichiometric quantity of sodium sulfite solution, yielding a precipitation of silver sulfite by the following reaction:

2 AgNO₃ + Na₂SO₃ ⇌ Ag₂SO₃ + 2 NaNO₃

After precipitation then filtering silver sulfite, washing it using well-boiled water, and drying it in vacuum.^[4]