Palladium(II) sulfate

Palladium(II) sulfate is an inorganic chemical compound with the formula PdSO₄. It is a hygroscopic red-brown solid that forms the dihydrate, PdSO₄·2H₂O.^[1]

Palladium(II) sulfate

Names
Other names Palladous sulfate
Identifiers
CAS Number	13566-03-5
3D model (JSmol)	Interactive image
ChemSpider	145977
ECHA InfoCard	100.033.583
EC Number	236-957-8
PubChem CID	166846
CompTox Dashboard (EPA)	DTXSID30884517
InChI InChI=1S/H2O4S.Pd/c1-5(2,3)4;/h(H2,1,2,3,4);/q;+2/p-2 Key: RFLFDJSIZCCYIP-UHFFFAOYSA-L
SMILES [Pd+2].S(=O)(=O)([O-])[O-]
Properties
Chemical formula	PdSO4
Molar mass	202.48 g/mol
Appearance	Red-brown solid (anhydrous)
Density	4.2 g/cm3[1]
Melting point	525 °C (977 °F; 798 K)[1] (decomposition)
Solubility in water	Hydrolysis[2]
Solubility	Soluble in conc. sulfuric acid[2]
Structure[1]
Crystal structure	Monoclinic
Space group	C2/c
Lattice constant	a = 7.84 Å, b = 5.18 Å, c = 7.91 Å α = 90°, β = 95.6°, γ = 90°
Thermochemistry
Std molar entropy (S⦵298)	97.5 J/(mol·K)
Std enthalpy of formation (ΔfH⦵298)	−672.4 kJ/mol
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H302, H314
Precautionary statements	P260, P264, P270, P280, P301+P317, P301+P330+P331, P302+P361+P354, P304+P340, P305+P354+P338, P316, P321, P330, P363, P405, P501
Related compounds
Other cations	Nickel(II) sulfate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Preparation and properties

Palladium(II) sulfate is produced by the reaction of palladium metal with a mixture of nitric acid and sulfuric acid. It can also be produced by the reaction of palladium(II) sulfide and oxygen in dimethylformamide.^[1][3][4][5]

When anhydrous palladium(II) sulfate absorbs moisture from the air, it forms a greenish-brown dihydrate. The anhydrous form can be regenerated by the heating of the dihydrate at 202 °C.^[1][4]

Anhydrous palladium(II) sulfate decomposes to palladium(II) oxide at 525 °C releasing sulfur trioxide:^[1]

PdSO₄ → PdO + SO₃