Caesium sulfate or cesium sulfate is the inorganic compound and salt with the formula Cs₂SO₄. It is a white water-soluble solid that is used to prepare dense aqueous solutions for use in isopycnic (or "density-gradient") centrifugation. It is isostructural with potassium salt.^[3]

• 
  Coordination sphere of one of two types of Cs⁺ site in Cs₂SO₄.
• 
  Environment of sulfate anion in β-Cs₂SO₄.

Caesium sulfate^[1]

Names
Other names Cesium sulfate
Identifiers
CAS Number	10294-54-9 Y
3D model (JSmol)	Interactive image
ChemSpider	23482 Y
ECHA InfoCard	100.030.589
EC Number	233-662-6
PubChem CID	25137
UNII	8D6R91CS62 N
CompTox Dashboard (EPA)	DTXSID10883109
InChI InChI=1S/2Cs.H2O4S/c;;1-5(2,3)4/h;;(H2,1,2,3,4)/q2*+1;/p-2 Y Key: FLJPGEWQYJVDPF-UHFFFAOYSA-L Y InChI=1/2Cs.H2O4S/c;;1-5(2,3)4/h;;(H2,1,2,3,4)/q2*+1;/p-2 Key: FLJPGEWQYJVDPF-NUQVWONBAO
SMILES [Cs+].[Cs+].[O-]S([O-])(=O)=O
Properties
Chemical formula	Cs2SO4
Molar mass	361.87 g/mol
Density	4.243 g/cm3, solid
Melting point	1,010 °C (1,850 °F; 1,280 K)
Solubility in water	167 g/100 ml (0 °C) 179 g/100 ml (20 °C)
Solubility	insoluble in ethanol, acetone
Magnetic susceptibility (χ)	-116.0·10−6 cm3/mol
Hazards
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H361, H412
Precautionary statements	P201, P202, P264, P270, P273, P281, P301+P312, P308+P313, P330, P405, P501
Flash point	Non-flammable
Lethal dose or concentration (LD, LC):
LD50 (median dose)	2830 mg/kg (oral, rat)[2]
Related compounds
Other anions	Caesium hydrogen sulfate
Other cations	Lithium sulfate Sodium sulfate Potassium sulfate Rubidium sulfate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references